I don't want to jinx it, but Isobelle has not thrown up for 7 whole days! We chose not to buy an auto-feeder but just fill her bowl with food, even though the vet suggested 2/3 cup a day. We shifted her to Science Diet Senior dry food, which she's eating though certainly not pigging out on.
And I'm making an extra effort to not only wash down after my cat sitting jobs, but also change clothes. This is in case she's sensitive to my bringing the smells of other cats into the house.
She sees the vet on Tuesday, so we'll get her vital signs and an update.