greetings friend, it sounds like you are doing excellent work at keeping her body fit. I would recommend you increase the exercise to include low weightbearing exercise like walking or swimming or an elliptical cross trainer if you have access to this which will be easier on your tendons. Usually this helps to avoid injury
much better than more demanding activities like running or tennis or soccer, which are much more straining to the body , ligaments tendons and bones.you should take as a supplement 500 mg twice a day of calcium with food and vitamin D 1000 units daily. This is for bone health. Cheers.