There's this movie I can't remember the name but it was about two sisters and they were mad at there dad and they thought that the woman that the dad was dating was trying to kill one of them. But at the end of the movie one of the sister is dead and the older sister was just seeing the little sisters spirit and they also explain at the end how the older sister killed her little sister, but it was a accident and the woman the ad was daiting wasn't really evil. She was just helping.

The Uninvited