It's great to hear she is benefiting from iodine, but the 89% in the test reflects a lot of the Iodine is going right thru her to her urine. If she tests again I bet it will be lower and be a more accurate reflection because she will start absorbing better. Which lab did she use?
Iodine will gradually make her symporters (iodine absorbers) work even better. Anti-oxidants will help get the oxidation-damaged symporters improved.
The salt water will help with any skin outbreaks. Is she taking that? That will scoot out the bromide which is blocking Iodine absorption.