E.,
I hate that you are having to go through all of this. I know what you are going through. I, too, have a 14 year old daughter and have gone through some very similar things. The sneaking out (or trying to), trying to sneak a boy in, the cutting, we've been going through all all of this for a while too.
It seemed like from the moment she turned 13, the little girl that lived here disappeared and this hateful "being" took her place. I hate to sound harsh, I love her with all of my heart and would do anything in the world for her, but she has really put this family through a very rough year.
You said that she has tried counseling....does that seem to be doing anything at all?? I had tried just about every avenue myself and was quickly running out of options when I ended up getting her into a counselor once a week. (I even went as far as to start looking up "boot camps" on the internet in front of her, hoping that would put some fear in her.) My daughter's hard-headed enough that if it bothered her, she never let me know it. After having her meetings with her counselor (along with having everything taken away from her), she started to change a litte.
Don't get me wrong, we've been going through this for a few months now, and even though she seems to be doing better...well, I keep waiting on the other shoe to fall! The counselor finally suggested that I meet with them. I met with both of them for the first time last week. It helped us to communicate with each other without yelling or getting off track of the issue at hand.
Something else you might want to try.....you might talk to a juvenile officer. I would go alone or call first while you are alone. (This was going to, and may still end up being my next move) You could try talking to a juvenile officer and asking him/her if they would talk to your daughter. The thing is....if things don't turn around soon, the odds are you're going to get to talk with one of them whether you want to or not. I say that because I worked in the legal profession for several years and that's usually the next step...they sneak out and end up in trouble. At least if you talk to one now, maybe you can head it off before it gets that bad. I've known of juvenile officers talking to kids before and letting them know what the consequences of their current actions can get them into. Sometimes it scares them into making some changes for the better.
Other than that...I just don't know what else to do or have any advice to give. I never put my parents through this, so this has been completely foreign to me. Too bad they don't come with instructions!
Let me know how things go...good luck and if you need someone to talk to, just send me an email.