maybe the dad isn't one for reasoning but if you get right up in their face that might work, but ask HER first or she might have to deal with a lot of crap as a consequence.
otherwise, the attack might force someone who's not reasoning to at least listen.
and don't you think for a minute that once she turns 18 everything will change. i'm 20 and i moved out for half a year and everything was good but as soon as i came home, i still ahve a curfew in the sense that i have to say where i'm going and who with and my parents expect to meet anyone i associate with. trust me your problems will not be solved in a few months if you can't fix them now, so do something about it now if you insist on this.
it makes me really upset to think of all these people getting so "serious" as you said at that age. i mean, the older i get the harder it gets, being serious i don't know if you know what that means, but it would be really reversing that and slowing the hell down.