Hi there, I have had both my knees replaced a year apart, it was worth it for me, I am 70 ys old, it has helped me a great deal, I can't bend down or get on my knees anymore but thats alright with me, I had mine done 6 years ago. but they have a new way of doing it now that they don't have to cut the knee like they use to and it only takes about 3 weeks off your feet. But I will say that your daughter does need to have that done at this point if not it will be a lot worse later on to have it done. I waited 3 years before I had mine done and boy let me tell you it sure wasn't easy to go through. Hope she has really good luck with hers. Best wishes