This happens sometimes... Dangit! I nanny for a family who has a diabetic cat that has to eat wet food before she gets an insulin shot. Once Taycie got to it.. and it gave her horrid diaherra..
I did call my vet, and she said, don't be to worried, this happens sometimes and she probably has an upset stomach.
Everything cleared up within 24 hours and I always makes sure I know where the cat food is before I let Taycie out of her crate when I get there