Bone density is less. Physiotherapist.

Hi, my grand mother has pains in all joints. I have showed her to neurologist and immunologist. Both doctors have told no problem with nerves and they suggested to consult physiotherapist. The day we consulted physiotherapist, he told to do scanning and X-ray for spine and bones. We did scanning and X-ray for bones and spine. Physiotherapist told that my grand mother has less bone density and she has osteoporosis after seeing reports. He suggested to start physiotherapy and use vitamins and protein tablets. She had physiotherapy for her both the knees and right ankle for 8 days but we didn't find any difference. I requesting to please suggest us what should be the problem and what is the right treatment for my grandmother. I am attaching her reports and prescription given by physiotherapist.