House cats, finicky about food..?
I think finding what she likes and sticking to it is the easiest way. Our cat (we had to give him away when I developed an allergy) only got one brand of dry food but he liked some of the bits and pieces cut off fish and meats when we were cooking. And I believe that's hard to beat when it comes to proper nourishment for the little killers.
Oh, and he sometimes ate rodents only in the summer house. :D