Saturday afternoon, T came in from off the porch and sat down in front of me. Her right pupil was wide open but her left one was a thin vertical slit. Over the next 12 hours it got back to normal, -ish. It's still a little wide, but at least it reacts again.
We'd been wondering how and when the tumor was going to start visibly affecting her. I guess this was the first sign.
And, maybe I'm reading too much into this but... twice now, I've seen her go into the hall closet, walk right up to the cat carrier she rides in when she goes to the vet, sniff it a bit, then walk away. It's on her mind, apparently.