Awakening (Chasing Yesterday) by Robin Wasserman
J.D. is found lying unconscious next to an abandoned building that had just blown up. No one knows who she is or where she comes from. All J.D. can remember is that she isn't safe. When she is released from the hospital she is sent to a juvenile care center where she discovers some dangerous abilities. J.D. must remember who she is, before she loses control completely.