An East Hampton woman is facing charges after she was injured in Sag Harbor early Sunday morning in a serious car accident.Sag Harbor Village police said they responded at about 2:20 a.m. to crash on Hampton Street and found a severely damaged 2007 Cadillac. Laura E. MacPherson, 28, was behind the wheel and conscious, police said, but had to be extricated from the car by the Sag Harbor Fire Department’s heavy rescue squad.A helicopter flew her to Stony Brook University Hospital with unspecified injuries. She was released on Tuesday.Police said Ms.