Hello, I am so sad to hear that. I have a boxer as well, and they do tend to get problems as they age of course. Taking her to the vet is all u can do and follow the best direction of what the Vet tells you to do.
Hopefully she is not in pain or gets much worse. Maybe there is some alternative medicine or treatment or something that you could try?
I hope she gets better, it is so sad when our beloved pets get older and get bad health. I hope to hear some good news from you?
Best wishes, Kandice