Our pets really do worry us.

Have you tried her with chicken? also maybe take her the vet if she isn't eating.
I also have a black and white cat and he has always been fussy with his food, he will only eat a certain type of cat food and even then he wastes it. I have started putting some of his treats with his food and he seem's to eat a bit more cat food now.

It's is worrying but my vet says he is a healthy cat.