The horrified mother of a 15-year-old girl viciously slammed to the ground and stomped on by a teenage boy said the horrific caught-on-camera attack followed weeks of harassment — and nearly killed her daughter. Lucinda Arroyo told The Post that the 14-year-old bully — who has since been jailed on assault charges — goes to school with her daughter and had long been bugging her in a bid for attention, leaving the girl stunned when the harassment turned violent Monday. “She’s very upset that her