Hi there, what you have described looks like rheumatoid arthritis
and is definitely of concern. For the time being you can give and analgesic
and an anti-inflammatory but after that you need to take her to your physician and get a thorough work up done for the same. She should also not try to massage
it or try any physiotheroy as far as possible give the joint a rest and cold
packs till you have visited your doctor. Take care.