What do these messages say? Maybe she is just upset about the whole thing. I doubt she is trying to assure you she isn't a slut - I mean, you've been friends since you were kids. I'm assuming you know each other too well for that type of confusion.
I think she is trying to convince herself that she isn't a slut. She has been pretending that she was totally blacked out during the act and that she doesn't remember doing it, although she knows all kinds of details that I never told her. She also told me not to tell any of our mutual friends, which I haven't. But then she went and told some of her girlfriends, who are definitely going to tell everyone. She came to the bar that night, totally sober, with every intention of having sex with me from the moment she got a call from me. And we do know each other very well. She's been being stalked the last 2 or 3 months now by 2 ex-boyfriends of hers, and these guys have been stalking myself and other male friends of hers as well. She has been really upset by all this, and I think she is having a real difficult time with trusting men...but she knows she can trust me, which is probably the main reason she fucked me. It still doesn't explain some of her behavior after the fact, though.
... it sounds like she's being pretty sketchy. You might know her really well, but your friendship is kind of low quality if you can't get a straight answer out of her. I have just kind of a peripheral impression of you, Rimmy, but aren't you the kind of guy that would just ask her bluntly why she asked you not to tell anyone, yet she told people, and how come she remembered details that you didn't mention? If you tell her that you want to stay 'just friends' with her, and yet act super-supportive in a genuine way towards her then maybe she'll be comfortable enough to be honest.
I'd let her read that. Most of it anyways. Honesty is the best way to go because she's probably torturing herself over trying to figure out exactly where your head is, just like you're trying to figure her out. Neither of you are being direct about anything because you don't want to risk that the way you feel maybe hurting each other. My guess is you're both sizing up each other's regret level but since you're both kinda holding bits of the puzzle back from each other, it's leading to all this awkard guessing crap instead. Just my 2 bits.