She's VERY posty through her hocks. Her knees and hocks are set kind of high, as well. Her back legs are almost completely straight when seen from the back, which isn't a good thing. A horse's legs are supposed to be a little toed out in back. It has to do with the way the leg is built to allow for correct rotation of the hip. She almost looks bandy-legged or bow legged in the back, to be honest. She does look to be a bit over at the knee, as well. Her front pasterns appear a bit long and upright, while her back pasterns don't look too bad. She's also a bit lighter on bone than I like to see. Her back is nice and short. Her neck ties in a bit low on her chest for my liking, though. I like her head. She looks sweet.
Overall, if you cover up her back end, she actually looks pretty decent. That hind end is scary, though.
Hope you get whatever is going on there figured out.