I watched this movie without knowing a single thing about it, and I think it helped that I didn't have any expectations. If you are looking for some specific content related a horror sub-genre, this might not be what you are imagining.
The movie begins with the central character, Cassie, being assigned to work with a younger troubled character, Nina. Nina is a defiant 19 year old who has already had numerous other people leave the position because of her difficulties. So you know the story is setting up the trope where Cassie will be different from everyone else and the first person to earn Nina's trust. Most of the interest of the story then shifts to finding out what is going on with Nina, and what is it about Cassie that makes her able to handle Nina's unususal behaviors. The other major characters are Nina's family, who demand that she conform to their expectations, and the doctor they have chosen to treat her.
Again, I wasn't looking for anything other than a good story, and I ended up pretty satisfied. This movie is more about the pressure of expectations than anything else. I liked how Cassie handled things, and seeing what decisions Nina made as a result. I didn't need the movie to contain specific things that I wanted to see; I was able to enjoy discovering what it had in store as it unfolded.