The changing clothes is what makes me think it could be cutting but you would likely find some evidence somewhere, especially if she's doing it THAT much.  If it's happening a lot it becomes much less easy to hide, even small amounts add up over five times a day.  

And yeah, the entire situation is creepy if she's not allowed to go anywhere and he's keeping her things, what the heck is going on over there?  smiley: indifferent