My pug has pateller Lux, diagnosed when he was 5 1/2 and it's mild. If she's having problems limit her to on leash walking only, no jumping or running allowed. Start her on a good fish body oil as it's a natural anti inflamitory and some joint support supplements may help her as well. Get the x-rays done and consult with the ortho vet so you can see the extent of her problem, if it hasn't progressed too much you may be able to treat with Physical therapy and supplements for quite a while.