My husband says our cat might have eaten some last night but he isn't sure if she did. He was eating some and thinks he dropped a piece but didn't see it anywhere and the cat was chewing something. That was a several hours ago is she going to be ok? She is acting just fine but that stuff is strong.

I would call an animal hospital, they are more experienced

Huh? Why on earth would you give your cat rotten fish? I've never figured out why people eat that crap, and I lived in Northern Europe for 3 years!