The 27-year-old was the poster girl of Glasgow 2014, where two weeks ago she just missed out on the crown at Hampden Park.
There have been no signs of a hangover in Zurich, though, as she qualified fastest from the heats on Wednesday and then again from the semi-finals.
Fellow Scot Lynsey Sharp is also looking strong as she seeks to defend her European title, having come through two rounds of her own in dominant style.
Child crossed the line in her semi-final 54.71 seconds and clearly had more left in the tank, cruising to the line with victory already assured.
"My coach just said to do what I did yesterday, but finish it off because I knew girls would be closer to me," she said. "I'm happy with that.
"Having the inside draw, it's nice to know what's going on. Ultimately I've got to concentrate on my own race, but it's nice to know where everyone is when you're coming down the home straight.
"I'm just trying to enjoy every race. The Commonwealths was amazing and I'm just loving coming out here and racing again."
Child has a day's rest before the final on Saturday, when she will follow reigning 800m champion Sharp onto the track.
Having seen British team-mate Alison Leonard, the fastest qualifier from the heats, fail to finish the first semi-final after a knock, Sharp and Jessica Judd avoided such issues by controlling their race.
Commonwealth silver medallist Sharp and Judd led from the outset, with the former winning the semi in 2:01.32 and teenager Judd following her home in third.
"I felt really good, as strong as usual," Sharp said. "I tried to stay calm and just run my own race so that's why I was running from the front.
"It makes a massive difference when you're running with confidence - I'm a different athlete to when I won the European title two years ago in Helsinki so I'm hoping to build on that."