KP-

It sounds to me like the gist of your question is should cats get a variety - for most cats the answer to this would be no. Not all, but most cats will become finicky if their food is constantly changed. Unless she is turning her nose up at what you are giving her, or unless she has to go on a therapeutic diet, or unless the brand she is getting becomes unavailable for some reason, don't switch. An occasional treat is fine, but the meal should remain the same.