She's hurting, that's the long and short of it, but it doesn't take a genius to figure that out. Calisto raped her and she hasn't recovered from it the way she should have. Like you said, she's been trying to forget and somehow that makes her want to go to random strangers who don't ask questions. And yeah, it's bad, but I'm not going to judge her for it, because I'm sure we all have our fucking awful coping methods, and that doesn't change how wrong it is, but whatever. That's what she's afraid of- that's everyone's going to abandon her because of what she did, which the Doctor sorta proved when he walked out on her.

Honestly, she didn't disclose all that much information to me either, but the rape thing was news to me. I'm still seeing red spots from how fucking pissed that made me. In fact there's a chair in my room that may never function as a chair again.

As I said, she's dealing with the aftermath of a horrific rape and torture session. That's all I can say, really. Seriously, we kill Calisto and she still manages to hurt our friends. That bitch doesn't die.