MWM, given that on this site you and I especially tend to see autism under every rock, if you say Jumper doesn't have autism, I will happily believe you!
I'm thinking - executive function issues especially attention-based problems with laying down memory. And when I say "attention-based problems" I am not talking about kids not bothering to pay attention. This is something more complex at the level of brain function, it is not a kid who just doesn't care. She needs to find her own way of learning so she can achieve to her ability. Her brain is still maturing, it will just take longer. If she wants to do stuff at the same time as her peers, then she will need to set her sights lower. But she also needs to recognise that when she is older, about ten years older than she expects, she will then be able to do the stuff she wants to do at 17. In other words - when she finishes school she could get a fairly low-pressure job somewhere, and work her way to the top. By the time she has worked for a few years she will have more confidence, more capability and her brain will have begun to really catch up so she WILL be better able to learn as she should. That is when she should consider college or university. In the meantime, she could have some nest egg stashed away.
Marg