My friend had a problem similar to this when we were in high school (just a couple of years ago!)

The more you push and invade, the more she'll push back. Charming devil boyfriends are the worst, but unfortunately, only your daughter can make that decision to cut him off. Just try to be supportive of the GOOD stuff for now (stay in school) and with the bad stuff, quiet disapproval and subtle statements can go a long way.

Good luck.