The shepherd in her would be prone to hip dysplasia. I think labs are too. Have a vet check her out. If it IS HP, the sooner you catch it the easier the surgery. And too advanced, it can't be corrected at all. Sometimes puppies from BYBs and mills have to be PTS as it is much too advanced for them to have any quality of life.

The vet will do xrays to determine what is going on.