Don't know about the hip thing, but I would change my vet; They could have scanned her to see whether the ligament had thickened. It is very hard with hind legs as there is no heat or swelling, and sometimes very little lameness.
I think the operation would be a good bet tbh. Mine went loopy like yours, and had to have a stable sized paddock complete with very high energized electric fencing! Good luck. Mrs Mozart, PSD is Proximal Suspensory Desmitis? or something like that, thickening of the suspensory ligament high up!
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