Enjoy the food. Enjoy your friend!

If she enjoys deep dish pizza or Sicilian style by all means enjoy her eating her favorite dish. I'm sure you can find something else like simple salad with slice of mozzarella cheese and some olive...Just because she wants to order something bit heavy doesn't mean you have to do the same.

I can also understand why she doesn't want to cook. My mother and my partner's mother do the same sort of thing as your friend. They just don't find it all that exciting to cook for themselves and for one. Cooking often is a means to make others happy and the reward is in the gratitude you receive. So frozen dinner and take out it is when it is just for yourself.

Well at least she is golfing and does some cycling. Could be lot lot worse.