Sometimes it is hard to tell from a picture how a horse is jumping as the whole motion of approach, take off, flight, landing and get away play an important role in determining form. Specifically from this picture, she looks like she has a good foundation and start to picking up her knees and using her hind end to power over the jump. Hope that helps!
Well, her ears are back, which judges don't love but aren't going to drill you on that. Also try putting the jump higher, so she tucks her knees more. But other than that she looks fine! :)