LBlS came through surgery fine; apparently she had a three inch hairball lodged in her stomach. With luck, that's the cause of the problem and not another symptom. She's doing fine in recovery, and with luck we'll get to see her after nine o'clock tonight.
I stopped by Goodwill and bought a light blue newborn onesie for her when she comes home. I like them better than e-collars for post-surgical cats, though you do have to be around supervising the cat if it only has the onsie on. It's got to be more comfortable than an e-collar.