Dr. Hibberd's answer:
 

Intermittent peripheral numbness with cool feet may be caused by protein and circulatory disorders, but  numbness may also be  from neuropathy, hypothyroidism, an autoimmune disorder, medications, vasospasm, toxins, or other problems.
 

You should have your daughter evaluated for this to determine the best way to manage and treat it. She will probably undergo some comprehensive metabolic testing, thyroid evaluation, and CBC blood tests.

In addition, it may be worthwhile checking her for cryoglobulins. Some people have circulating proteins called cryoglobulins that can lead to cold extremities and numbness in winter months. They sometimes are associated with skin discoloration in severe cases.