Rheumatoid arthritis or another immune disorder?

My twin sister (aged 32) has very rapidly got symptoms of Rhuematoid Arthritis. Her joints, in her elbow, knees, ankles, and swollen and painful, she has hard, hot lumps forming in her legs and elbow, she is very fatigued, has fevers, she also has a sudden reaction to alcohol. She can't have even a sip without it making her feel terrible, her urine smells unusual. For the past few years her allergies have got worse, she is allergic to cats, some foods, dust etc, but the reactions are getting more severe. She is under going tests right now. We have a family history of Rhematoid Arthritis but the symptoms came on so quickly I'm curious if she has any other under lying causes.
Thank you