Young female driver, flipped over guard rail while driving a Nissan SUV on Sills Rd. (Rt. 101) just under LIE (Rt. 495) overpass in Yaphank just after midnight 05/01/2013. She was able to self extricate herself. Yaphank FD & SCPD responded. Yaphank F. D. secured the vehicle and pt. was treated by Yaphank F. D. EMS.