Well, she ha upright pasterns, that is pretty muck zero shock absorption, and that can cause joint problems. Imagine where all that weight is going, on a horse with straight up-and-down pasterns? What about a horse with nice, angled, springy, flexible pasterns. It absorbs the shock of the bounce, for both her and you.
She has a knife neck, thin, under-conditioned topline, and flat on top. Work on getting her to bend her neck into more of an arc and lift it up, and really bring her chin in. Make her pick up and round her back and engage her hind end. This will strengthen her body overall and in the long run, you will see vast improvement This is a good example.
She is sickle hocked and posty in her hind legs, this may lead to issues.
She has a decent shoulder, a good shoulder is a big factor in any running horse. I'm not so great at judging shoulders, someone else can narrow it down and specify for me.
Her hooves are small and her legs aren't the best.