TBH I don't think the seizures are related to the hyperthyroidism.
Nothing I have been able to find on the internet about hyperthyroidism has mentioned anything about any seizures as symptoms.
She's 2 weeks through her 3 week course of tablets so if I assume the hyperthyoidism is beginning to be controlled that if the seizures were related to that they should be going away.
I'm beginning to think that the hyperthyroidism and that the seizures are seperate issues. Whether these are caused by epilepsy or something more sinister is a different matter. I don't suppose there's much they will do bar put her on anti-convulsants initially and I'm guessing they won't want to do that until the hyperthyoidism is under control - be that by medication only or the thyroidectomy op.
Having said all of the above I admit I am a terrible pessimist....
Aside from the seizures she seems very happy in herself.
Oh, and thanks Mel (and everyone else) for your thoughts.