She likes more than cheese and tomato sauce on her pizza, she just didn't know it.
With my 7 year old niece visiting, we made pizzas from scratch. We tasted ingredients before we put them on the individual pizzas. Without talking about them as toppings, we enjoyed tasting bell peppers, mushrooms, sauteed chicken, even raw sweet onion and olives. She picked what she wanted as we assembled our own pizzas and for the first time she had more than just cheese and tomato sauce on her pizza, and loved it.