But rather than give up, she has hatched an ambitious plan B.
A below-the-knee amputee who lost her right foot in a boating accident when she was 16, Reid had hoped the F44 long jump, the event in which she won silver at the 2012 Paralympic Games, would be included in Glasgow next summer. When it wasn't, Reid decided she would attempt to gain the qualification standard for the able-bodied long jump.
"I'm not going to make any bones about it, I know it's a long shot," she says. "My personal best is 5.28m and the Commonwealth Games standard is 6.22m - that is not an insignificant amount to overcome."
But Reid, 28, is determined to pull out all the stops. "I've committed to this wholeheartedly," she says. "I've changed a lot of things this year to give myself the best opportunity. I've switched coaches to long jump specialist Rana Reider, who coached Olympic gold medallist triple jumper Christian Taylor. I've changed my training programme, the way I run and the prosthetics I'm jumping off. It's been a massive learning curve. But I believe in adventure. If you know what the end result is going to be, then it makes things boring. I figure, aim high."
At the IPC Athletics World Championships last month, Reid watched Germany's Markus Rehm set a record and win gold in the men's F44 long jump with 7.95m. "That re-affirmed to me that it is possible, a female athlete is going to jump over 6m - and I want to be the first," she says.
For Reid, the words failure or fear simply don't feature in her vocabulary. Born in New Zealand and brought up in Toronto, Canada, she is the middle child of a Scottish father and English mother. She represented Canada at the 2008 Paralympic Games in Beijing, winning bronze in the T44 200m, but switched allegiances to Britain two years later. This would be her first Commonwealth Games and she can't wait to pull on a Scotland vest.
"My dad is from Glasgow and always tells me: 'No matter where I go in the world, if I don't meet a Scotsman, I meet someone who wants to be one,'" she smiles. "Scots love sport. There is so much pride and you can see that in the commitment they have to their football teams. I think it's going to be a real mad house next summer. My dad has often talked about going to watch football internationals with his friends, all of them decked out in their kilts and faces painted. Scotland is a country that enjoys life and having fun."
A promising rugby player in her teens, Reid was on a carefree day out in Canada when a split second saw her life path irrevocably altered. She recounts events with unflinching frankness. "I was run over by a boat and caught in the propellers in two places: my right leg and across my back. We were three hours from a hospital and the blood loss was severe," she says.
"I remember the whole thing. I was tubing with some friends, which is a bit like water skiing but on a large inflatable. The whole point is you are meant to get thrown off into the water, that's part of the fun of it. The boat we were on was really big, so there was a spotter to let the driver know if someone fell off. Apparently there was a miscommunication as to where I was in the water."
Waiting to be picked back up, Reid saw the boat in the distance coming towards her. "It was going way too fast and I realised they couldn't see me," she says. "Going through my mind was: 'You've got to miss the propellers'. I was a good swimmer and decided my best bet was to surface dive as far as I could under the water then wait for the boat to pass over. But I forgot I had a life jacket on and didn't get very far. I saw the top of the boat pass over and was under the water for a long time. In that moment time seemed to stand still. When I first surfaced I thought I was fine. I remember thinking: 'That was lucky.'
"Initially I thought I'd lost my bikini bottoms and was worried how I'd get back on the boat without all the guys on board seeing. It's only when I tried to pull them up that I realised. The cut was so big I reached right inside it. Then I saw the blood and in that moment actually thought I'd been cut in half. No one would let me look at my leg, but I could feel the bone and skin crunching together. I knew it wasn't good."
Taken by ambulance to Toronto, surgeons battled to save her life. Reid survived but her right foot was the collateral damage. Doctors believed amputation was her best hope of having a future sporting career. They said that Reid would only ever have 40% use in the damaged limb, but improving advances in prosthetics could allow her to one day return to the rugby field.
A testing period of adjustment followed. "It's almost like a mourning process," she recalls. "You have lost a part of you and your life is never going to be the same again. I changed as a person. I wasn't expected to live and that changes your perspective on things."
Reid embarked on a new life, gaining a full academic scholarship to study biochemistry at Queen's University, Ontario. "I decided 'If I can't play rugby internationally I'm going to be a doctor'," she says. "That was the intention, but four weeks into my first year, I happened to watch track and field practice. I thought: 'I wonder how fast I still am?'
"So I called up the coach, he was taken aback at first but said: 'C'mon out, I'm game'. He told me that if I came every day and was consistent, he would train me."
Her hard work paid off and four years later Reid made the Canadian team for the 2006 IPC Athletics World Championships. "I decided to put medical school on hold and see where it all went," she says. "A lot of people thought I was crazy. It was a time when no one knew much about the Paralympics, so it was like: 'Do you really think you are going to have a good career as a one-legged sprinter?' But I knew if I didn't give it a go I would regret it."
The 2012 Paralympic Games in London, says Reid, went a long way to help tackling the awkwardness people have when discussing disability. "It has not only removed taboo but completely changed the idea of where disability sits in the social conscience," she says. "Before, it was always quite negative, people saying: 'I feel so bad for you, that must be really awful'. The Paralympics showed a group of people with disabilities that were ambitious, competitive, articulate and actually really normal."
Reid chats happily about owning a cupboard full of legs for every occasion. "I have five legs," she says. "I have an everyday leg which doubles as my weightlifting leg. It's comfortable to walk in and I could probably run for the bus wearing it. I then have a high-end running leg which is one of the fancy blades. I have a swim leg, a high-heel leg and a general sports leg which allows a bit more lateral movement if I'm playing basketball or rugby."
She is keen to confront the stigma surrounding disability. "I do a lot of talks at schools and one of the big questions kids want to ask me is: 'Do you feel sad that you don't have your leg?'" she says. "It's quite sweet and I always try to get across that, yes, I would much prefer to have my real leg than an artificial one - and you guys aim to keep yours - but it's not bad. I know I've done a good job when kids say: 'Man, I wish I had an artificial leg. That's cool.' Every one of us is going to face a challenge in life. It's not if, it's when. It's how you chose to interpret and deal with that."
She and husband Brent Lakatos, a wheelchair sprinter who won four golds and a silver at the 2013 IPC Athletics World Championships, moved to Loughborough University this year and it will be their base in the run up to next summer's Commonwealth Games.
Lakatos is aiming to compete for his native Canada in the men's 1500m T54 wheelchair event and, like Reid, faces an uphill battle. "Brent is a sprinter so 1500m is going to be a challenge," she says. "He wants another chance to represent his country and is going to go for it. He will be up against the likes of David Weir, but he had a great World Championships, is feeling confident and ready to take them on."
Reid isn't overly fond of the term "motivational speaker", but admits it's something she has a natural gift for. "I just want to present a really honest image of what life is like," she says. "Ultimately it is tough. I'm not going to sugar coat it. I want to be honest about the things I've done wrong in my life and those I've done right.
"I've spent a lot of time in different countries and in British culture I feel there is a lot of fear around failure which makes people afraid to stand out too much. I've had a lot of negative reaction when I told people about my goal to jump over six metres which surprised me. I thought: 'Gosh, at what age were kids told to stop dreaming?'
"I'm OK with saying I'm going to do this and, if it doesn't work out, that everyone is going to know about it. I won't feel bad about it because I'll know I tried. It's exciting and whatever happens I want to be in Glasgow - whether that's competing or helping hand out water bottles to other athletes - I'll be there and taking part."