Bailey accidentally ate a reeses peanut butter cup one night last year. My grandma was opening the packaging and the cup flipped onto the floor. Bailey is so funny b/c if you drop food on the he will race to get it and then run away with it (so you have to be quicker and careful)... but if I try to give him something, he acts as if I'm poisoning him...lol... Anyway, he was just fine. He threw up one time and had diarrhea once (with a few loose stools to follow). Bailey also has a very weak tummy and is on special ID food (from the vet). I would just watch her closely and make sure she's staying hydrated with water. If she is still throwing up within the next hour, I would take her in. Good luck and my thoughts will be with you.