Well I'm 32 now, but I hated at that age, living with mom. But I graduated with honors and ended up being made to be good. She put a healthy fear in me.
I would often tell her I was moving out. She said she would call the cops and have me drug back for being a runaway (you can do that in florida)
Then I would tell her I was calling child protective services. She then would proceed to tell me to call, and that if I did she would make it worth their wild to come and get me YIkes!
She would take my battery out of my car. I was aloud no freedoms at that age, and lord knows my friends were afraid too.
Then when I was 18 and she couldn't stop the moving out thing. She let me know how hard it was. She let me move out the day I turned 18, and even gave me $1000 to go with. I got an apartment, and within a month that money was gone. I was working like crazy but couldn't keep up or pay my bills. Guess where I ended up having to go? Yep mom's. Where I lived again till I got married at 20. I still had to be in by midnight. Still no sleepovers at other peoples, no boys in the room, etc. But I didn't fight her at all anymore.
So your the boss, get in her face, and mean it. Call the cops if she leaves, and drag her little butt home! If she can be amanicipated, let her have fun trying. Then when she does let her find out how hard it is. Let her know you love her, but she made her own bed and let her lie in it. It will be hard, especially when she makes terrible decisions.
and if she see her in a dangerous position I agree with previous poster, have her bakeracted.
It will pay off in the long run.
I love my mother, respect her, and am still very much her little girl