Goodbye, Amanda the Good — Susan Shreve

She dyes her hair purple, wears black clothing, and calls herself Cheetah. Can this really be the girl known to her family as Amanda the Good? Not anymore!

Sometime between sixth grade and junior high, Amanda Bates woke up and discovered she'd become an entirely different person. Her old clothes felt wrong, her old friends felt wrong, and her family definitely felt wrong. When Amanda attracts the attention of a ninth-grade boy with a criminal record, a whole new group of troublemaking friends seems to follow. But is the new Amanda bad enough to make it in the girls' Club? Or will her old self win out?