We're still not entirely sure what she ate, but I suspect that lessons have now been learned. The timing of the beginning of days of copious vomiting (tmi?) would point toward Christmas tree preservative, which I have certainly now learned to keep covered with a feline-impenetrable barrier.
A trip to the vet for an examination, X-rays, fluids and five days of anti-nausea medication was the Slightly Retarded Kitty's early Christmas present. It was tough to see her go from a loud, sprightly, perpetually ravenous (and not afraid to tell you about it) kitty to a listless, anorexic, sad little thing. My nights were spent sleeping only very lightly, waiting in dread for the sounds of middle of the night retching. Being the obsessive documenter and recovering science nerd that I am, I even kept notes.
If you've ever nursed a sick pet, you will appreciate the joy that I felt when she took her first tentative nibbles after days of not eating.
Today we celebrated the SRK being off the anti-nausea meds and resuming her hearty appetite (complete with food flying all over the kitchen) and her general exuberance for life, by taking the cat grass down from its hiding place. Vigorous chomping ensued, along with much burying of kitty noses deep into the greenery, followed by a major nap. We appear to be back to regular programming.