All she had was the half-tablet of pain medication the evening she came home. (It was Fred, not Fish--this "2 cats with 4 letter names beginning with F" is turning out to be somewhat confusing to all, added to the "girl named Fred" too....)

The hissing reaction finally quit yesterday afternoon sometime, though, for whatever reason, and Fish and Fred are back to companionably playing together. I was beginning to get a little worried there for a while!