Fish thinks she's an intruder--she doesn't smell like the cat that left the house this morning. He's been hissing and growling at her every time she gets within 5 feet. I've tried re-anointing both of them with the scent I used to help introduce her, but that had no effect. Agatha hisses, too, but then she always does.
Fred is moving around easily but is in dire need of head scritches. The incision needs to be watched for heat, swelling, or seepage, but beyond that she should be done--the stitches are internal so they don't have to be removed (and she can't pick at them). And she should no longer be bothered by those hormonal surges.