Hey ,
Like Bernadette mentioned anemia, hypothyroidism and poor circulation can lead to feeling cold.
In addition, if you’re looking for clues you could look for patterns of complaints. For example when your daughter has a slow thyroid, you could look for other symptoms like hair loss, thinning of the eyebrows, constipation, slow movements, concentration problems, dry skin or poor wound healing. It’s not necessary to check all the boxes.
Anemia could also cause people to feel cold. The cold would be more in the hands & feet. Other symptoms that group together with anemia are pale/yellow skin, shortness of breath, rapid heart rate, headaches, dizziness and fainting, and concentration problems.
Emotional insecurity/anxiety can also cause feelings of coldness.
Other reasons why children feel cold can be dietary. I don’t know if your daughter is a big eater. A calorie deficiency can also cause people to feel cold.
A pale tongue however fits more with anemia. When you like to test blood to be sure, make sure that your doctor also checks vitamin B12, folate, iron and ferritin as well.