This is a very complex problem and you need expert advice. As far as I can find out neither radio-active iodine nor surgery are options at your daughter's age. It seems to be a question of adjusting the Carbimazole dose correctly. I have discussed your question with an expert paediatric endocrinologist Dr Ekkehard Zollner at Tygerberg Hospital. He is very willing to advise you and has asked you to phone him on 0843648758
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