Thyroid is critical. It acts as a regulator for so many things in the body including constipation, body temperature, etc. B12 is also critical and it seems different doctors have different views. On my labs, the normal B12 range is 200- 1400...this is a huge range. I asked my first family physician to give me B12 when my labs came back at 200 on the nose. (This was 2 years before my celiac diagnosis and I already been diagnosed as anemic for quite a while). She refused to give me injections. Within a few months, I started having migraines. I changed family physicians and complained of my headaches. He sent me to a neurologist...first thing he did was look at my bloodwork and say that he thinks he can help just be raising my B12 level. Sure enough my migraines stopped. The continued to look at my blood work over time and continued to increase the frequency of my shots...eventually we reached a diagnosis of celiac. I have been gluten free for about 3 months and continue to take B12 injections weekly.
Best wishes for you and your daughter. I hope you get answers very soon.