Abby in Space Race by Andrea J. Loney

It’s time for the first ever OASIS Space Race, a virtual reality obstacle course designed to make space’s required exercise fun. Abby and her classmate Dmitry both want to win for their age group, so much so that they don’t pay attention to the rules and accidentally get stuck in the simulation, glitching their friend Gracie’s designs. If they want to find a way out, they’re going to have to work together.