that said, this it is what I would have done; based on my experience with my pregnancies. I was Iodine deficient, borderline hypo T. Based on my symptoms.
So, it is up to her, what to do. The overwhelming task of being responsible of a new life.
When already taking t3/t4, chances of the baby needing it too; is very likely. Iodine or not.
In general people dont get off meds. Thats how the system is made.