Thea has now been to the vet. Poor kitty had to put up with Such Indignities. (She got an antibiotic shot, should hold her for 10–14 days, and if I don't see an improvement in her UTI symptoms in 2–3 days I'm to call the vet.) She'll be fine.

Though if she decides she doesn't like the taste of her cranberry supplements (for bladder health) when their contents are on her wet food, then she will be putting up with Such Indignities twice a day! (Vet nurse showed me how to give her a pill... Very Unhappy Kitty.)

Thank you all!