I have no idea who’s cat it is. She just appears in the yard, and my kitteh inside the house freaks out so badly he’s actually attacked one of my other kittehs. I think the miscreant is the mother of Fred the Insane, who is the one who was attacked. She looks just like him.
Well, just damn. You don’t have a lot of options, do you. That sounds grim. Sorry.
If I were in your shoes, I would trap, spay, and release her.
When we had our first two cats, if we left the front door of our condo open (had a screen door, too), a neighbor’s cat would
sit outside the door, a tiny, tiny Siamese. She was an adult, just very small. She just sat there, staring in, not saying a word.
Muffin, our male would go berserk and attack our female, Tiger. She was a little *itch, and she held a grudge against Muffin
for two weeks at a time.
We stopped leaving the door open, and we opened the sliding glass door to our itty bitty fenced-in patio instead. The little
interloper couldn’t get over that fence. She was too tiny.