She promptly went under the bed, just in case I decided to put her back in the crate for another trip. Emerged briefly, and hid again when I took a step in her direction. I settled down at my computer with a cup of yogurt (the good Greek stuff) to finish some work, and after a few minutes she appeared and took over the spot under the desk lamp. The next time I picked up the yogurt, she sat up and gave a short, demanding "Awwp!" I offered a little yogurt on a finger, but that was rejected--she'd like a little luncheon in bed, thanks. So I fed her chicken-and-gravy baby food off a spoon, much to the envy of the other 2 cats. Am I well-trained or what?
This morning she demonstrated her great ability to find new hiding spots by disappearing about the time I was ready to try the hairball medicine/syringe trick. A good 15 minute search of all previously known hiding spots, in rotation, yielded no Agatha, and I was beginning to get worried--then found her curled in a little basket that holds things-to-be-mended, that was pushed back under low-hanging items in my closet. She just fits the basket when curled up tightly, and the the clothes that hang above it provide excellent camouflage.
Fish report: the seemingly bottomless bottle of antibiotic finally got emptied this morning, and the cystitis symptoms have eased. Fish will be unhappy to miss his spoonful of baby food tonight, I imagine. He apparently decided the medication process was not all that traumatic, as he never hid from me when I came to get him for the towel-wrapping.