Hum, tough one. All I can say is that it seems that you are describing me as a teen. I was awful. I ran away from home, stole my mothers things and gave them away and tried a ton of drugs. I had everything I wanted, there was no reason for me to act the way I did. This behavior followed me into my early 20's when I finally hit rock bottom. I guess I was depressed, as I occaisionally suffer from bouts of depression now (I am 31). You just have to be there for her and DO NOT give in. Let her know that you love her no matter what, but that you can't stand for this behavior and set boundries and make her sign a contract so she knows what the consequences will be for each action. Then it would clearly be her fault. She couldn't blame you! Example: If you run away you will be grounded for a week. If you stay out past cerfew you will have to come in double the time you stayed out next time. Things like this will make her responsible for her consequences not you!
Also, does she like to write or act? Maybe you can enroll her in a class that help her to make some different friends. Girls can be brutal at this age, maybe some of the popular girs at school are bothering her. Maybe something happened to her and she is just too afraid to tell you....
The only thing I can say is that I am okay now. I have 2 wonderful children and have been married 3 years. I have a very well paying job and I am almost done with college. All you can do is be there for her. Beyond that, you can't control her. I know this must be distressing and as someone who hurt my parents, I can say she will apologize later. I will say some prayers.
Trust in God with all your might....he can heal all things!!!
B.