What is the disorder that Nani is suffering from in Black Swan?

I'm trying to write a paper for my psych class on it and I'm having a very difficult time narrowing it down. From what I can tell she has signs of Schizophrenia, Borderline personality disorder, OCD, and maybe a few other things. I'm trying to narrow down the symptoms she shows and figure out exactly how accurately the movie is depicting the disorder. I have a few ideas to argue, but the paper is supposed to be shot and I tend to overdo things. Any ideas?