An idea for your fatigued client. If ever there was a person needing the companion nutrients, she is it. Her poor body has been through so much, and deserves replenishing. I suspect a healthy dose of B complex would also help.
For her iodine, she might consider experimenting with what would be the highest dose she could take and still function. She might be a candidate for either 2% Lugol's (2.5 mg per drop) or Iosol (1.8 mg per drop). She can further dilute these in water, then drink just part of the water. After she finds a starting point, she might then see if she could work up to sipping some of this water several times a day. Maybe because of her history she'll never be able to high-dose iodine. But I like to think there's some level she could tolerate, and that'd be a start.