If you're looking to watch any movie with bullying involved, I stumbled across Cyberbully while I was watching Rookie of the Year on You Tube(of all places).
Cyber Bully is about a teen girl, who gets a a laptop for her birthday and signs up on a social networking site. She starts to feel alone as her friends ostracize her and she falls victim to cyberbullying.
While I was looking into that movie, Odd Girl Out gets recommended to be watched.
Odd Girl Out is about a mother and her daughter that confront the intimidation of teen peer pressure and the emotionally brutalizing social rituals of high school. Her mother must help her daughter regain her confidence.
I haven't seen neither movie, and I don't think I could bring myself to...especially with Odd Girl Out. I felt a bit triggered just by reading what was on the parental guidance page.