I have a 15yr old girl. There are many issues not least the one where she has refused to go to school for the last 18 months.
I battled and battled with her on this, we had months when I spent every morning practically tearing my hair out trying to get her out of bed and into school swinging between anger and tears. Then they threw her out 
Since then we've gone from pillar to post trying to get her educated against her will until... ahhhhhh, I let go.
I can't tell you the relief. And Breathe.
It's down to her now, if she wants to be some hot shot then she's going to have to work at it herself. I love her but I'm not going to pick up the pieces any more.