After a 12-year-old Brooklyn girl killed herself, her mother is speaking out against her peers and her school. Last week, Mercedes Herrera found her daughter Maria near death in her bedroom closet. Maria, who had tied a belt around her neck, died shortly thereafter at Brookdale Hospital. Initial reports of Herrera's death noted that she was upset that her stepfather wouldn't let her visit a friend, but her mother detailed her classmates' cruel behavior. Mercedes......