Another update. She had been making improvement, but on hard surface at vet t follow-up she was still sore trotting circle to right, sound straight and to left. Did about 3 months of ponying (with ace help). Vet had us start trotting under saddle. Was sound at slow and medium trot, but still off at larger trot (not even her full trot). Trainer was wondering if she had scar tissue from being non mobile for so long.
About 3 weeks ago she was still off, then had a major bucking fit for unknown reason. After that she has been better even at a bigger trot where she had been sore. At check yesterday, she looked great even trotting to right on hard surfaces. Now to start some turnout in a controlled situation (with ace) and then to start cantering assuming she stays sound. First time I have felt encouraged.