She is very butt high, however she still is quite young and almost all young horses grow out of it. She looks very upright in her hind pasterns but so did my yearling and he evened out. Its important to remember that she is probably going through her gawky growing phase.
Well, here is the good that I see in her: she doesn't seem to be cow hocked much, she has a nice short back, nicely sloped shoulder, and a pretty head.
The not-so-good that I see: she is a little upright in her pasterns, she is built very downhill which might make saddle fitting later on more difficult, and her neck ties in a little low for what I like.
However, other than that, I'd say she's a pretty nice looking filly. I'd say that she will grow out of the being built downhill, but she might still be a bit downhill even after she matures. Good luck with her. Pretty color, too.