Well, I am not so up on QH confo and whether or not shes built for speed, but I'll give it a go,lol.

She seems to have nice straight legs, maybe toes out just a touch or it could be the way shes standing. Nice slope to the croup, her shoulder may be just a bit straight. Again, it's hard to tell sometimes and especially when they're in their winter woolies, but in one shot her neck looks a little short and in the other it doesn't.
She has a beautiful, sweet eye and of course I'm a bit partial to bays anyway,lol.
I ride Mountain Horses and the conformation required for the gait is a bit different than that of Quarters, but I would say you have a really nice girl there. The few faults I see are very minor.