Bull tacos! Get yourself another vet. If there is truly nothing to be done (which I doubt) you may have to put her down. The danger is injury to her knees and below that will result in infections that you eventually won't be able to control. If you can go to a university with a vet program, so much the better.
If your vet doesn't return your calls as you say ... first thing you need to do is find another vet. How old is your dog?