Originally Posted by Ashleysmardigrasgirl
basically OP, she looks a lot like her draft horse parentage. Sickle hock is excessive angulation of the hock joint (in horses a conformation fault, in drafts it's desirable I.E. Shires, as back in the day it used to be thought to aid in a draft horses capacity to pull) and coupling is the area behind the last rib and in front of a vertical line dropped from the point of hip. Horses with excessive coupling tend to have an adequate back size but long/weak loin which hollows their back and can lead to back problems if the horse has a chronic hollow back. This could also make it harder for a horse to successfully 'drive' with it's hind quarters.
I like her though, and agree you should give it a go with her. Good luck with your mare.
Oh interesting! Thanks a lot for the information, definitely good to know!