Solo & Nonsolo At The Same Time

This is a word were people use magic so there like wizards. And every year there are games were they people make groups to compete. So anyway this story is about a girl named Catherine and she's solo so she doesn't have a group to use her magic in the games until this year when her sister gets involved in a fight and can't compete in the games. So Catherine takes her place and pretends to be in the group. But there she meets a guy and a girl who make her world change. But before that she has to get used to being nonsolo which is hard and she also has to start talking. But she has to be careful with her magic.