I could only give you a story from the child's view.
My mother was and is an Air Force Slut, She's been married to this last one longer than any before. I think it's going on 20yrs now but it's probably lasted because she finally got old. She's on her 7th marriage at this time so you can only imagine how many men there were total in order to arrive at #7. Consequently my brother and I were dragged from base to base throughout our childhood, every single report card had a different last name signed at the bottom and never completed a semester in one location.
#6 pushed me over the edge at 16 by charging me rent and trying to take the keys to my car. I moved out and have never been back. But see there were no drugs involved and I had a job (several), AND put myself through college.
I'm a cynical prick because I don't have family to smooth out life's rough spots, it's just me and the wife. Like right now, just lost my job due to another persons incompetence. And if I hadn't socked away some cash, I'd be homeless in a couple months. Your daughter doesn't know how good she has it ... her parents give a ****.
It's the **** drugs more than anything else, once they get that "easy feeling" that's all they want and think it will last forever if they can just get away from the "bad people". I never had more motivation, energy and focus than when I was a teen. It's only later in life that I realized that all the "you can be anything you want" crap was crap.
I don't know what to tell you about girls, you can't put them out like boys ... some ******* will take them in and use them. You got it rough man, did the courts assign you any professional help for her? I hope Canada has better programs than the States ... here if you put a kid in a program it's just training them to be a REAL criminal.
I sure hope you get some good advice that works, I feel for ya.