Try some finely chopped or grated apple or carrot, or some cooked and chopped green beans, or green peas. I add these to Myndi's food since she is on a rather tasteless prescription food for her kidneys. She used to get the yummy Cesars too, and that's about all that Sparky still eats - he loves all the different flavors.
Your little one must really be picky if she's getting tired of Cesars.