To start off the critique, she looks well balanced. Other than being bum high which is likely due to her growth spurt, she is well balanced. I don't find her more heavy in front or long in the back.
I find her neck is set at the base of the shoulder which is what you want to see, however her head and neck are a little bit small for her body. Her neck length should be one third of the horse's total length, but when I measure it its a little bit shy of it. Her head is a bit small, but quarter horses are naturally more inclined to have a smaller head simply based on the breed.
Her shoulder is a little bit to upright for what I would want in a horse. The angle of her shoulder is an indication of what he gait is likely to be like. A steep shoulder will cause the horse to have its front legs to far under her which will not allow her to extend as much as you will want her to(ex:extensions and long flowy trot). With a short choppy gate, you will get more concussion in her front end. If you notice, most horses have a similar angle in their pastern which is the case with her.
Forearm spacing is normal for her age. I wouldn't want to see it this narrow in a horse who's working full time. Her legs are very straight and I can't see anything unusual with her front legs from the front. I dont see her cut at the knee or cut out under the knee, which would be a sign of weakness in the leg which would have put pressure on the tendons.
Her pasterns are of appropriate length and slope. You want an angle between 47-55 degrees which she has.
Her croup is definitely not level with her wither, but thats normal for a growing youngster. Something to re-evaluate when she is 3.5-4 yrs of age and she is near finishing her growth. I really like the shape of her hind quarters. Her stifle sits a bit higher giving her a triangular shaped bum, and does not match the height of the elbow which again is because of her growth spurt. If you look at the rear view tho, you can see her stifle is well formed and directly under her hip which is what you want.
The angle of her hocks is very nice. It is where it should be. It is hard to see with her tail in the way, but she looks to me like she is a little bit cow hocked, tho it could just be how she is standing, because I can see her front end was not properly set up for the photo, so I have a feeling she might be off balance. If she is cow hocked, it's probably one of the most common hind leg conformation faults. It will put more strain on her hocks which can cause bone spavin, tho in her case it would be very minor.
Hope this helps.