My dog might * have eaten some mini hershey chocolate bars + wrappers?

Hi, I was doing my term paper and I heard this crunching noise in my sister's room. After two minutes or so I go into her room and see what it is, and sure enough, my dog has her head in the bag of chocolate and has one in her mouth, just chewing on it. (My sister was right there on her computer... and didn't notice anything, !!!). Anyways, we're not sure if she ate a few or what, but if she did, what are the signs I should look for? And how could these little wrappers affect her digestive system? Should I still feed her breakfast tomorrow? Thank you for any and all help! xx