One more thing to add - it can never hurt to get a second opinion from another vet, just in case.
It may seem like it sprang up suddenly, but before the first pinning incident, did she show any other signs of being a more dominant mannered dog? When she was around other dogs, did she ever growl or bark to correct, try to mount, or try to put her head over the backs of the ones she was playing with? I'm just thinking that it could have escalated over time, but you just didn't know the signs to look for?
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