My Friend Maggie by Hannah E. Harrison (2016)
Paula and Maggie have been friends forever. Paula thinks Maggie is the best—until mean girl Veronica says otherwise. Suddenly, Paula starts to notice that Maggie is big and clumsy, and her clothes are sort of snuggish. Rather than sticking up for Maggie, Paula ignores her old friend and plays with Veronica instead. Luckily, when Veronica turns on Paula, Maggie’s true colors shine through.