The 26-year-old was back in action in Moscow's Luzhniki Stadium yesterday morning, just hours after finishing fifth in the 400m hurdles showpiece the previous night.
Despite this being a fine result in the Scot's first major outdoor championships final, Child was left ruing the fact that her personal best and national record of 54.22 seconds would have been good enough for bronze.
However, she was afforded the perfect chance to get over the disappointment as she went in Great Britain's 4x400m relay squad the very next morning, leading the quartet off as they won their heat in 3:25.39 minutes.
With her hurdles rival Perri Shakes-Drayton dropping out through injury, the British squad look to be in a fight for silver with Russia after the USA cruised in the other semi.
But Child reckons she's capable of stepping up and producing the race of her life. "It's a lot easier to run quicker when you've got the team behind you," she said. "You don't want to let anybody done. I'm fairly new to this because I've only really been properly in the team this year. But there's a real bond there with the girls. We do want to support each other. You want to do your best.
"There's that little bit extra when you have the baton in your hand and you think: 'there are three others relying on me to do my best.' It gives you that extra couple of percent to get your butt in gear."
Child insists she is determined to make the most of her second crack at the Russian podium after breezing into today's 4x400m final.
"After sleeping on it I would have to say I am quite happy with how my 400m hurdles final went," said Child.
"Obviously my PB would have won a medal but then again if everyone had run a PB, I would not have been near a medal. So to get fifth in the world and to come out with a solid run in my first global final is very pleasing.
"I found out after the final that I was going to run in the relay heat so I just tried to recover as quickly as possible."
While Laura Muir failed to reach the 800m final, finishing her semi-final seventh in 2:00.83 min, and Jamie Bowie failed to make the quartet for the men's 4x400m final relay squad, there is another Scot joining Child in a world final.
West Linton's Chris O'Hare finished his 1500m semi-final in fourth in a time of 3:43.58 min to go through to Sunday's showpiece, the first Brit to do so for six years.
Although he might be making it up as he goes along, the 22-year-old admits he couldn't care less after a dream debut championships to date. "I kind of pretended that I knew what I was doing, in races like these you have to blag it because these guys know what they're doing," he said.
"I had to put a brave face on and blag it and to be in a final in a stadium like this is just fantastic."