It's not that she's insane, it's about how far someone is willing to go for their art. I think it's one of the best films of the last 5 years and it really does match up with the wrestler as a double bill. Both films about trying to achieve perfection in your art, not matter how high or low and how the characters end up going to such extreme lengths to do so. Perhaps I got that because I studied an Artistic subject but it really really resonated with me.
Shame is also amazing.