My Daughter Is 21 Years Old And Her Tongue Is

My daughter is 21 years old and her tongue is yellow. Her primary suggested more water and water based foods. She can brush it off but it keeps coming back. She has JRA and her last blood tests just a month ago were all good. She takes Humira. This morning she felt light-headed and had a stomach ache but otherwise feels good and the symptoms come and go, they are not constant.