Kitty seems to be back to normal, perhaps eating a bit more than usual as if to show me, "No appetite problems here! Everything's fine - I feel great - look how much I can fit in my mouth! I LOVE kibble!"
The vet called this afternoon and it was all good news - blood work came back normal, urine screen was fine - everything looked OK. Still don't know what it might have been or if it was really worth the ordeal she went through, but I guess we know for sure nothing serious is going on.
I'm sure she never wants to return to any vet at any time ever again - never ever. Maybe tonight she'll put on a play and show us how many push ups she can do.