She just needs to eat healthy, lots of fruits, vegetables and soups, milk and dairy products (in moderation), lean cut of meat, fish (if she does not eat you can ask her doctor if she can take
omega-
3 supplements), cereals, whole grains etc. She needs to drink 7-8 glasses of water per day. You can ask if a multivitamin supplement will help her.
And am sorry, but there is no cure for RA. Take care!