lol this is the dumbest question.
Oh my god, people are smoking weed.
It's pretty much legal here you can't get arrested unless you have over 8 grams, which is 16 joints.
So
whatever who cares?
Just tell her to tell them she doesn't want to smoke weed as much anymore and she won't turn them in.
Who the fuck cares

Its just weed.
The guys won't do shit if she just keeps her mouth shut.
She can't turn them in because she has no proof its her word against theirs.
The guys are just trying to keep a piece of ass around.
Tell them to fuck off problem solved.

Well that's horrible. Now she should get a digital recorder for her pocket.