She came home again on Saturday night. Their theory is that she had colic on Wednesday, then the stress of being cooped up at the vet gave her some gastric ulcers that caused her discomfort on Saturday. So she's on horsey Maalox for a week. When I saw her yesterday, I was pretty alarmed by how much weight she'd lost. Not that she couldn't have stood to lose a pound or two, but it was a pronounced difference.
Overall she was her usual alert self. We gave her a bath to clean up some of the muck that accumulated in her tail from being at the vet (and all the oil they put in her). She also got about 1/3 flake of alfalfa. The vet wanted her started on alfalfa at first because it helps draw water into the gut to keep things moving through. She should be getting more food as the week progresses, and will hopefully be back to most of a normal diet by next weekend. I'll likely be out tomorrow again, so there will be more updates and pictures then.
Thank you to everyone for your good thoughts!