Nah, I thought that right away too, watching too much SVU, and true crime books, I do, but the molestation themes were definitely there, I thought. Plus, she had that door blocking routine, probably because the mom was coming in there one some late night creep type thing.
The thing with Black Swan, for me, was it was just relentless, no comedy, no relief, just nail biting, (literally) tension throughout, dread, unease, was just brutal.