Need the name of a scary movie?!

im hoping someone out there knows this but i started watching it more near the end!. a little girl was trapped in the backseat with either her mom or sister (cant remember) the mom/sister ends up dieing and the little girl falls asleep!. when she wakes up a killer has put on the cloths of the dead sister/mother (you cant tell its someone else)!. anyways the killer eventually try's to get the girl but she finds a way out through the trunk of the car and the killer starts chasing her!. shortly after the little girl kills the killer!. cant quite remember how but i think it was by her stabbing him!. i swear i randomly think of the movie after seeing it a year ago!.Www@Enter-QA@Com

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