I can't remember this movie i saw once...?

the movie was a kinda scary one. The movie was about a girl and how er mom or her parents made a deal with the devil or some evil Deity. The woman I think she lost her baby in the restroom and the devil shows up to make a deal so the unborn baby can live. Well she does and around the girl's 18 birthday maybe? Idk. I think the movie had her name in it but im not exactly sure. I think it also involved a mental hospital for the mom but once again i may be confusing it with another movie