Hate to tell you, but she's an adult and at this point can make her own decisions, poor as they may be.

You've already voiced your concerns and set up some good boundaries concerning this guy. Beyond that, her mistakes are going to have to be hers to learn from.

I understand your concern. I have a 24-year-old son, and it is hard to step back and let them be the adults they are and make their own mistakes, but that is what needs to happen.

I would impress on her that if she leaves and things go badly, she will need to find other living arrangements rather than to come back home at this point. It's hard to cut that cord, but sometimes that is all we can do after we've put the facts in front of them.