Thyroxin is a T4 only thyroid med. Also, tell her to read http://www.stopthethyroidmadness.com
and http://www.naturalthyroidchoices.com
This is a site run by Stephanie Buist, Iodine advocate and patient as well as friend of Dr. David Browntein ("Iodine, Why You Need It; Why You Can't Live Without It"). She is also thyroidless.
Your client is probably gluten intolerant. Gluten is often a problem for hashimoto's patients. Your patient probably had hashimotos, before developing thyroid cancer. Going gluten free as well as going on Iodine (detoxing of all that bromide) and companion supplements. Stephanie's Iodine group is: http://health.groups.yahoo.com/group/iodine/