Have you tried her on steroids? I have had girls with it int eh past, but unfortunatly for them it was very fast....My girl Pepper has it right now too, but she is on Prednisone, and it has made a HUGE difference! When I first took her in, she was circling, doing the push back a bit, very unsteady and seemed unsure of things...then the vet gave her a shot of it and within a few hours she was almost back to her old self... Now she takes it in pill form, but I am just so happy that it is working and she is doing so much better!
I really hope your little Pea has a slow growing one, and that with a little luck and lots of love she can feel a bit better for awhile at least. I am sure she knows how much you love her! Lots of good wishes and kisses for Pea and you!