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Hello. Thank you for asking your question. My name is***** will try to help.
I have an idea.
For cats that we can not get oral medication in we can have a compounding pharmacy make a gel you apply to the skin, usually on the ear, daily. Do you think you could do that?
Your vet will have to call in a script for the transdermal gel.
You can also get the medication made in a flavored tablet or a meat flavored liquid.
I found a pharmacy in New Zealand that makes those specialty type medications.
Otherwise I can not really tell you if she will have a painful death.
The high thyroid levels normally cause high blood pressure and kidney failure over time.