First, I would be very careful in giving medical advice to your friend based on the replies here on Mayo Connect. Second, I would also suggest that you encourage your friend to join Mayo Connect to read posts of interest as well as posting their own questions. Please remember none of us are medically trained and are not really qualified to speak up when it is outside of our personal journey.
My suggestion would be your friend needs to treat this as a new problem and not related to PMR, prednisone or Kevzara. Wanting to eliminate symptoms is human nature but until there is clarity as to the cause of the symptoms no one is actually acting in their own best interest by only addressing the symptoms. I would advise them to go to their PCP and present the symptoms and ask for help in getting to root cause and an appropriate treatment.