Way Past Mean - Hallee Adelman

Ruby wants her friends to like her more than she wants to be nice to the new girl at school. Once Ruby starts being mean to the new girl, Nelly, she can't stop. She likes being part of Yaz and Keya's group, so she also makes fun of Nelly and hurts her feelings. It's like Ruby's on an out-of-control roller coaster, but it's up to her to stop the ride.