Thanks for the tag. - as a fellow thyroid sufferer, I will say the most important test is antibodies. That's the auto immune factor. Be sure your daughter gets tested for thyroglobulin and peroxidase. Vitamin levels such as vitamin D and iron. Ferritin and selenium. I also suggest that she cut out inflammatory foods such as dairy and gluten. It's an elimination diet and she must be strict with it. After a few months she can slowly introduce one at a time and she will be able to see also if certain foods are causing her issues. I'm in the process myself of doing allergy testing and looking to see why levothyroxine is bothering me now after 20 years of being on it. I found lennett laboratories manufactures it now and acquired Levo roughly a year and half ago. / so could be ingredient formula change. Hope your daughter feels better / I felt the same and just got dxd with Hashimotos last December. I've been on AIP diet and noticed a huge difference but something still us bothering me and only thing it could be is Levo. It's a very hard disease to live with and each of our cases is different, but I do know the thyroid controls the whole body and each cell thrives on t3. When we take t4 pill our liver converts it to t3. Have a full thyroid test done and tsh doesn't mean squat if you have Hashimotos.