Those are all good questions for her MD or a PT if you know one.
Personally, in early season or after a sedentary spell I get aches and pains in the joints that have not transmitted much force lately. As my muscles and tendons tone back up, I feel better. It's possible that if she rides some more she'll improve. But I'm only 56, and I wonder if this recovery I experience would happen as quickly as I get older?
Ibuprophen or other NSAIDS can help me, too.