This mare strikes me as a smallish mare but her overall porportions are very good. Back to neck to leg balance of porportion seems good to me. She IS cowhocked, which is rarer than people think but I think she is, as you said.
She has nice short canons both front and rear and tho cowhocked, has a nice hind quarter and the hock joint is good sized and not overly open or closed.
Can't see if she is on flat ground but she appears a bit downhill in build.
Neck is set on high to a strong shoulder and good heartgirth, Neck a tiny bit short.