I love her hindquarter and shoulder! Not really a fan of those hind legs, with the cow hocks and toes out, but that might just be uneven growth. I would see about having your farrier do a 'corrective trim' because these things can be fixed in young horses if you encourage them to grow in the right direction.
She is a little bit downhill (might be just that she's a yearling and therefore probably in an awkward stage, in which case she'll grow out of it) and it really IS hard to tell about those knees but they're not back which is a really good thing. Over at the knee really isn't something you need to worry about unless it's a moderate to severe case. IF she is over, she is only mildly over. Mildly over at the knee is actually something a lot of racehorse trainers like, because it reduces strain on the tendons, whereas back at the knee increases it and also creates incorrect wear on the joint, leading to arthritis.
Other than the downhill and the hocks, I really like her. I think assuming she'll level out or end up uphill-built, and that those hocks get corrected, she might make a lovely sport horse :)