Sounds like she is really struggling...she's engaging in a whole lot of risk taking behaviour (especially the truck thing) that is really scary.

I think what she needs most is people around her who believe in her and her potential. I would encourage her to stay at school as long as possible as the risk is she leaves and becomes totally aimless...which could lead to further problems.

It would be fantastic if you could find a school that has a great mentor that she could relate to. Someone who is going to stick by her, encourage her and occasionally kick her butt into gear. I would think that what she needs most is security and protection as she isn't providing that for herself...

I think the stats are scarier for kids who are struggling and leave school early than those who struggle but stay.

Hope it works out.