I Know Who Killed Me (2007)
Lohan plays Aubrey, the young daughter of affluent parents who is abducted and mutilated by a sadistic serial killer. She manages to escape, sans a hand and a leg and lots of blood. The girl who regains consciousness in the hospital claims to be not Aubrey but Dakota -identical to Aubrey, but with a much different demeanor. Dakota struggles to convince anyone that she is not Aubrey and finds herself in a desperate race to save Aubrey's life and her own against overwhelming odds.