What do you tell you daughter?
I tell her pretty much what you said in the rest of your post.
Now, if you're asking me what I would my daughter if she was THIS girl? Well, honestly, that's hard to figure because I don't know what her parents taught her before.
I mean, if my daughter had done this, I would have no need to have said any of the stuff in your post because I covered that long ago. And, no matter how dumb she'd have been, "I told you so" is not terribly appropriate.
Point being, I'm sure I'd simply do my best to help her get through it. Yeah. She'd have fricked up, but that's water under the bridge. It can't be undone by brow beating her about it. It's one of those cases where, despite your teachings, you kid decides to learn you were right the hard way.
The only thing I've been saying about this case is this. It does no favors to the NEXT potential victim for us as a society to run around afraid to talk about how this girl fricked up for fear we'll be accused of "blaming the victim". She's already been a victim. I'm worried about the NEXT girl. I'm hoping the NEXT girl sees this and learns.
BUT. For some reason, when these things happen, we kill ourselves to NOT talk about the girl's mistakes and to me, this sends a message to other young women that they are somehow "entitled" to be as wreckless as the want to be.
That might sell in a feminist ivory tower, but sadly, there will always be men on the planet who prey on such girls. I'm not sure being "right" is terribly helpful to your psyche AFTER you've been victimized.