She's been going to counseling for various things... this is all she's got:
-PTSD from being raped at 5 (not by a family member, it was a neighbor kid she and her brother hung out with)
-bipolar disorder (very recently diagnosed, just started on lithium)
-shitty, complicated family life (though who doesn't have one on this board?)
-polycystic ovary syndrome
-physical pains that she got surgery for, but they still come back (just not as often)

I'm not sure that I'd describe her as "getting off" on pain (I don't think she derives any pleasure from it), but she has told me that it's a fundamental part of her (as in, the opposite of pain to her is nonexistence). One of the reasons she started cutting was to bring herself out of the dissociations she would get during her depressive periods.

So basically, I'm at a complete loss on what to do. We're really, really close (as in, she'd be my best friend anyway) and we don't really argue, but this is one of the things that if I don't handle it properly, we'd end up in a huge fight.