Why won't the vet see her? That's weird. Can you try another vet? My friend had a similar situation. Her pup was favoring another leg & hopping. It wasn't LP though. It was just inflamed. They put the pup on medication & bed rest and it eventually went away. Personally, I would demand to be seen. Or see someone else. There is a possibility that it could be LP. But you'll never know unless you get her checked. I just think it's odd that the vet is blowing you off