Should we keep quiet?

[Tink]

My 18 yr old daughter has a real knack for picking guys who are simply trouble.
She's been raped, beaten, verbally abused, and just can't seem to break the pattern of choosing bad boys. Obviously this has been going on for years and we've had to intervene and even go to court to help her get away from a couple of them.

Now that she's 18, she really does not want our opinions or advice about her love life. She's getting too involved again with a guy who has been in and out of jail many times and is a total loser, but is trying to keep it to herself because she knows we don't approve. She's been with him off and on when he's not in jail for the past year and a half.

Since she already knows how we feel about him and she simply chooses to ignore our advice, it's not terribly healthy to OUR relationaship with her to keep harping on it. Yet we worry that she's going to get hurt again or worse.

So what would you do if you were her parent? Is it better to just keep quiet and hope she learns on her own? I don't want to totally alienate her in the process, or she may not come to us when she DOES need help. Arrrrrrrrgggggggg