My first thought is are you SURE there is shire in there?
She has a good hind leg, well placed hocks and knees with slightly light bone. She is tied in at the knee. Her shoulder is correct and her neck placement is correct. She is currently level. Her prominent withers will make saddle fit a challenge. She has a solid hind quarter that ties into a well placed gaskin. She is currently a little long through the coupling and she stands over a lot of ground.
I see Thoroughbred and Quarterhorse and very little draft in this horse. The only concerning thing about her conformation is the high withers and the tie at the knee.
It also looks like whoever is trimming her feet should be replaced. She has incorrectly trimmed feet behind.. with a low slung heel that makes her hinds nearly slipper footed putting a lot of stress on her hocks which are a bit light. Her fronts seem similar (most recent photo).