I'm no expert in QHs. However, so many in the breed, look so different these days, it's difficult to tell.
With this mare, the first thing I see, is that she is extremely straight in the rear. No angulation. She also has an incredibly sharp wither. Difficult to tell about her neck, but by what little I can see, she might be ewe-necked. She has a poor rear - lacks length and strength from point of hip to point of buttock. She seems to have a pleasing little face.