At 0849 hours, officer responded after caller advised juvenile was aggressive and fighting with staff, and had to be held down. Officer left the facility, as juvenile had not committed a crime. At 0924 hours, officer responded again after staff reported the juvenile had set off the fire alarm and forced her way into the medicine room. While staff were removing her from the med room, juvenile bit staff member on the back, leaving a red mark. Officer charged juvenile with battery 2nd felony and transported juvenile to JDC.