My vet had me try that "duck and peas" food on my cats. None of them would touch it. A sudden change in diet or feeding is too much of a shock to their system and they will protest. Smokey had a good idea - mix it in with her old food - the one she will eat - and gradually increase the amount. Cats are smart, she will probably figure it out and pick out the stuff she wants and leave the rest, but maybe she'll get enough of a taste of the new stuff. Good luck and keep us posted!