Well, this poor misdirected girl is doing what seems right to her and isn't doing anything truly wrong (just strange and weird and nasty), and she knows the consequences may not be comfortable and that she'll probably fail (again)...
I've lost a lot of friends to this type of thing. And I try my best to help them and it doesn't seem to work. And then I kick myself thinking "what else should I have done?"
So your daughter must equally have the right do do what seems right to her, knowing the consequnces may not be comfortable.
Is she prepared for the worst case senario (which is DF obviously)? If so, who gives a rats-arse about them? Act as you see fit.
If she's not ready for that, then best to get ready for it so it's no longer a real threat (easy said, I know).
If you don't feel like ignoring them, you could offer to help sheperd this stranger she's writing about and guide her with your daughters experience; or you could get stuck into her father - he's responsible; or engage in a family orgy/love-in on their front lawn... who cares...
I'd just have a laugh about it and show it to all my friends....
Max