She is post-legged behind, that's the opposite of sickle hocked. (Sickle hocked = too much angle in the stifle and hock; post legged = too straight, not enough angle)
Not a terrrible flaw, usually managed by keeping a baseline level of fitness.
I don't see pigeon breasted?
Agree with the other posters about the rest; overall impression of balance and quite mature looking for a three year old.
My thoughts exactly^