^ Ha.
Well, I'm not going to say anything to her, at least not in the near future. She is quite new to "life situations" as well, and she is learning the hard way by making spontaneous decisions to the detriment of her relationships (she's done this many times in the last year, much more so than ktspktsp).
For me, the only "tearing her a new one" occurs in my decision to not trust her as much (less than I already did) in the future. Almost all of my other female friends would immediately see red flags in an offer to go camping, regardless of who made it, because they know me well and they know these situations. The ones I trust would say, "How does Abaya feel about this? Have you asked her yet? I wouldn't be comfortable in this situation if I were her..." (that's what I'd say to someone who asked me).
However, I will give our friend the benefit of the doubt and chalk it up to inexperience and naivete. She may also have just assumed that since ktspktsp was asking her, that he must have already checked it out with me and that I was okay with it. She didn't ask him that though, so it was an iffy assumption on her part. She'll learn. I hope.