🦴🦴Gran has Osteoarthritis & CKD. Would collagen powder etc make her worse?

My 86yo grandma has CKD (not late stage, medicated, managed), osteoarthritis, and a curved lower spine. Our bad weather has increased her pain massively and left her stuck at home since Christmas. She’s a bit down, lost appetite, a little weight, but mostly muscle. Would extra protein or collagen powder help her joints, bones, or muscle, or could it cause kidney problems? Any safe ways to support her nutrition and joint health would be appreciated! (she has refused any opiods for pain btw)