Geraldine Hilling, 44, and her husband Charlie won the money in the Lotto draw in 2005.
The former IT manager, of Cumbernauld, was speaking at a charity event as they helped deliver Christmas presents to children at the Glasgow Riding for the Dis-abled Association in Maryhill.
Mrs Hilling said: "It's great to come along to things like this and it has kept me busy over the last week or so.
"I have to say I miss my job. I was an IT manager with Glasgow City Council. I don't know if I would go back to the same thing but am thinking about retraining to go back to something else.
"I am still quite young and I think I retired 20 years too early. I am not complaining but you do get a bit bored sometimes."
Geraldine was joined at the event by other Lotto winners, including Brian and Ann Sharp, from Musselburgh, who won £2m in 2010.
The winners from across Scotland gave their time to support the centre, which backs 400 children and adults who benefit from regular equine therapy there.
Mr Sharp said: "I have donated money to the Hearts Foundation and help them out in any way I can. My perfect Christmas present would be for Hearts to come out of administration."