A woman has turned herself in after allegedly running over an Islip Terrace woman and leaving her to die.Investigators say 25-year-old Heather DiFede was on the eastbound side of Sunrise Highway around 4 a.m. Sunday when she was hit.Police say 25-year-old Brook Fadness, of Port Jefferson Station, surrendered Sunday night. According to police, Fadness was arrested after she turned herself in.