My cat will eat anything but peanut butter and of course is never allowed anything with chocolate or alcohol in it at all. Other than that most things are okay, but not necessarily good for your cat.
Stick to dairy products (not milk) and meat as "people food" treats or some cats love bread crusts. It should never be much, if you decide to give your cat any at all, and many people don't. Some cats also love greens (spinach, lettuce, etc) and that is good for them occasionally.
If you do decide to give her some, only give the amount that fits on your pinky finger.
Although I think one thing everyone could agree on is straight, unfried meat, like even a chicken leg or piece of beef.