(As you might know, that has no added iodine, and
neither does the salt in
processed foods. In
fact, there has been an increase in
babies born with thyroid problems since sea salt became popular and
mothers were misled that 'natural' is always better.)
Anyway, since giving iodine worked (and
since she received no treatment for autoimmune thyroiditis), we can assume the goiter arose from thyroid deficiency. The thyroid does not always go down completely after that, btw.