An American Girl: Chrissa Stands Strong (2009)

10-year-old Chrissa Maxwell move to Minnesota with her family in the middle of a school-year and she's struggling to fit in at her new school. The first day at school she meets three bullying girls called "The Mean Bees". They immediately start to harass and bully Chrissa and soon her life turns into a cruel nightmare. The three bullies make life hard for her, and when the worst bully becomes Chrissa's swim rival, it's time to do something. What can Chrissa do to stop the three bullies?