I'm looking to see if anyone can identify this movie. It's about 6 years + old. A couple live in a house near the sea and white cliffs. The couple find a girl, clearly shook up and unable to speak. They take her to the doctor, who makes a diagnosis that she had her skull forcefully open. (something about her parents opening her skull to let the evil out).
There is a scene in the movie where a mass cow/people suicide takes place off the white cliffs.
The movie ends with the girl drowning, and the woman trying to help her out. She fails however, and is seen falling in to the water with the girl.
The end of the movie is quite difficult, and ends with the woman being locked out of her body, and the spirit of the girl being inside her. They all go to the house, where the husband shuts the door and the spirit of the woman is locked outside.
At the very end, the now possessed woman opens some sort of lock-box with a hidden key, and takes out some pictures.