I can remember the movie was about a girl that thought she’s haunted and in the actual movie she really seems haunted by a monster but the monster is actually a girl with hair coming down on her face. I can’t remember any details but I think the girl is telling her family or smth that she is haunted but no one believes her. The most important thing I remember is the final scene where she is at a hospital or something I think she thought the monster tried to hurt her but when she looks in the mirror, the actual monster is her. I think I was 5 when I watched that movie and since then I’ve been trying to find it.
It could be the Grudge 1 or 2…