I'm Trying to Get My Sister to Eat Good Macaroni and Cheese, but She Doesn't Have It

My sister routinely tries the beougard the holiday menus, and so much of her identity is wrapped up in what she does in the kitchen. Telling her that she isn't throwin down any more will only make her angry or herd plus, i'm afraid that saying something will leave us with a cook who is very angry. She has never been good at hearing or taking criticism. Please help me, let me know what to do. And happy new year.