What would you do if it was the BF and NOT your daughter? Or one of the friends? Or my kid (and you didn't know her or me)?
Wouldn't you turn them in with the thought not of revenge... but one of "this may be the thing that gets them well."?
I think the consequences NOW will be less than the consequences LATER.
Do what you can live with... and know you are in my prayers.
(((Lostparent)))