There are auto-immune diseases that many different doctors treat. Such As:
Psoriasis-Dermatologist, Chrons'-GI doc, Diabetes and Hashimoto's Thyroid-Endocrinologist. This is just a few. A rheumatologist does specialize in Lupus and Rheumatoid Arthritis and all AI diseases that affect connective tissue.
I would demand something to help her with the pain if the Tramadol is not working. Could you call the Pediatrician? There is no reason to suffer in that way until a diagnosis is reached. I hope you all find answers soon.