Best Friends (Until Someone Better Comes Along), Downing Erin

Isabella Caravella is dreading summer. She doesnt want to spend a month at a lakeside resort with her parents and the families of her dads coworkers, especially when she discovers that two of the kids go to her school. She thinks Bailey and Ava are beyond weird--and theyre not exactly thrilled to see Izzy, either. Izzy has been their tormentor, the leader of the pack of girls who made their first year of middle school so unpleasant.

Once Izzy discovers that the other kids have been spending their summers together for years and shes the outsider, she realizes shes going to have to change her bossy, stubborn ways if she wants to fit in. Bailey and Ava turn out to be kind and welcoming, and Izzy actually wishes she were more like them.