IMO, She has nice confo, especially for a TB! I would agree with you that her back legs are alittle odd, maybe just a itty bit camped out. She needs some more muscle in her butt & back legs. For being a hunter, she isn't necessarily considered to be very "flashy" since she has no white on her. Her tail is also oddly very short for a 12yo. Can't really tell her movement without picture/video of trot, canter, or O/F. I would say she's a nice horse though! (:
I really do not care if she doesn't have a lot of white on her. In my area many horses do fine in Hunters with little white.
Her tail has been cut, that is why it is so short. I looked at it myself, and it isn't short because she can't grow it.
She has decent movement from what I could tell when her owner was riding her. She felt very balanced and comfortable to ride.