Hi dear user
I have gone through your question.
I can understand your concern
Some symptoms of your daughter(sensitivity to cold, feeling hungry, heavy bleeding and
dry skin)can be symptoms of
low thyroid function or
hypothyroidism.
At the other side feeling anxious and nervous and the urgency to have bowel movements can be attributed to
hyperthyroidism.
Your daughter have a history family of autoimune thyroid diseases(Morbus Graves or Hashimoto's diseases),so,it is probable that she can have a autoimune thyroid condition.
My advice is to talk with your doctor about her symptoms and to repeat the thyroid function test and a thyroid
ultrasound t to see the thyroid structure.
These tests will give the answer if your daughter's symptoms can be related to any thyroid condition and if this is true,other tests like thyroid autoanticorps will be necessary for the right diadnose.
Hope I have clarified your doubts. If you have any further queries, please feel free to ask. I would be happy to help.
Best regards.