Is it the same food you have always given her? Did she just start reacting? I know cats can develop sensitive tummies and it might be a good thing to try and switch her food to see if that is the problem. I know we get tummy bugs around here sometimes where they throw up all their food for a couple of days and then it seems to pass.
If you decide to change her food do it slowly. Start by mixing it with her old and gradually increase the new food if you don't see any problems. Make sure you keep an eye on the litter box as well as watching for vomiting. Sometimes new food can cause constipation as well as very loose stools. It won't hurt to try switching the food to see if thats the problem, just keep an eye out for problems. Which we all know you will! You're such a good meowmie!