What Are The Chances Of Celiac Disease Being Misdiagnosed As Fibromyalgia?

I am checking for a friend who is too tired to do so. She is 75 and has been diagnosed with Chronic Fatigue/ Fibromialgia , having the the maximum number of symptoms (43) for years. Is it possible that she was misdiagnosed or also has Celiac disease? Carolyn Van Konynenburg YYYY@YYYY