Since there's nothing else I can really do for her now except give her cuddles, which is difficult when she wants to hide away from the light, I will keep her comfy and safely away from party guests tomorrow, then get her to the specialist ASAP next week. There are 3 treatments: lifelong medication, surgical removal of the thyroid (riskier since intrustive surgery), and best chance is radio-iodine chemotherapy, which is a week stay at the hospital then she'd be fine. The chemo only works in some cats, though, so the specialist has to determine if she's a good candidate. At least I know there are treatments, and we are well on the way to knowing what it is & how to fix it. It's still a little hard to be as enthused about the party as usual, but I have done all I can do for her today, which is really the best I can do for her right now.
Melanie was vacuuming for me while I was at the vet, which was even better for keeping Kylie calm since she hates that, and Kael was helping with Batato Chips too. Their afternoon timing was impeccable for keeping party prep going while I zoomed over to the vet. I am VERY thankful for helpers this year!
Back to party prep now...thanks for the good thoughts for Kylie...