I see it in a completely different way now. A ballerina became completely consumed by her role. A dark force slowly possessed her as the film went along until the possession was complete. It was her alter ego that wanted to take over her entire life. It was sad actually. Many celebrities are struggling with that in real life.
I thought the film was much deeper than that and commentary on how we expect women to be sexless, 'perfect' little girls, yet want them to be sexual animals, lustful and giving of their bodies. It's about her character dealing with this conflict, that you can't be 'mommies little princess' and an absolute slut at the same time. We expect women to be walking paradoxes.
I'm not sure if your spiritual views skewed that for you, but that was my take away. There was no possession, no 'dark force' or alter ego overcoming her, only man's lust for sex pulling her in opposing directions, and eventually killing her.
I didn't remember seeing that lesbian scene before with Natalie Portman and Mila Kunis. That was really hot. Wow.
It's an incredibly erotic scene, best sex scene I've scene in a genuine movie; the scene where Natalie Portman masturbate is even more so though. It's hard for me to sit still when watching that masturbation scene, I just wana leap up go out and find her and fuck her absolute brains out.