Delicate? is that another word for picky?
How about Pesto and pasta? Pasta can be served up with just butter and salt, or you can make a cheese sauce or mushroom sauce (can of mushroom soup) - you don't need meat and tomato sauce for good pasta.
Eggs? will she eat them? If so soft boiled, hard boiled, fried and the like. Its not just a breakfast food. Lately we have been doing eggs in the basket where you take a slice of toast, cut out the center, and fry the egg inside of the hole.
The Potato is the mainstay of our diet around here, you can bake them, twice bake them, mash them, fry them, mix them with green beans (beans and taters). I make a mean creamy potato soup too.
Fruit salad, salad with every vegetable but tomato and onion. Um, fried zucchini, fried okra, steamed, baked, sauces to add would be cheese, or pesto (light oil with herbs).
Yogurt? Maybe a tad over some cut up fruit? cottage cheese, heck sliced cheese and crackers and fruit...
I think what you should do is ask Auntie what it is she eats and try to follow that.