Tough!: A Story About How to stop Bullying in Schools by Erin Frankel (2013)
Sam is concerned about keeping things orderly and "cool" at school. She thinks people need to have a tough skin in order to fit in and withstand others’ meanness and lack of cooperation. Sam teases her free-spirited classmate Luisa and enlists a friend, Jayla, to help. But when Sam is confronted by a concerned teacher about her bullying, and Jayla turns on Sam and befriends Luisa, Sam begins to show some heart and rethink her treatment of others.