Even though her mother says she's not gay, this is still homophobic bullying (transcript available at the link):
Anti-gay bullying also targets girls
Again, what is the school doing to fight this sort of bullying? What programs are in place to teach kids not only that violence is wrong, but that homophobia is wrong and that girls don't exist as play-things for boys? Accountability can't happen in a vacuum; these tragedies should inspire proactive, reality-based anti-bullying education.