Crust is delicious! But anyway, I would say leave the crust on so that it's never an issue and she's just used to seeing it that way?
I know this is a different situation, but it drives me fucking crazy when I see kids at my restaurant being the most finicky eaters, and it's about stuff like crust on their grilled cheese sandwiches, or the wrong size straw that they don't like or whatever, and the parents don't tell them to just deal with it. That was how I was raised, eat what's on your plate, have what you are given, and it really made me a non picky eater at an early age. Seriously, I loved all kinds of foods, because that's the option I was given, to try everything the way it is.