She lives! She turned up on my back porch within the last hour but she is not a well cat. She's moving slowly and walking sadly and when I put out some food for her, she inspected and rejected it, opting instead for a few laps of water from a nearby dish. I put out two other small dishes — one of another flavor of Friskies and one of some moist, dark meat turkey pieces that were going to be part of my lunch. No interest.
This is not like her. This is not like any feral cat that's in good health. Our old pal The Stranger Cat acted like this in his final days.
I called the two vets I know. Both are closed for the weekend but one phone was answered by an assistant. She says there's nothing they can do today except tell me, "Keep an eye on her." So I'm going to keep an eye on her.