Are all PB&J sandwiches in WDW those Uncrustables? DD tried one 2 years ago and didn't like it. She might like it this time, but I would like to be prepared.
I also have two boys who love PB&J but don't necessarily like the uncrustables(too much peanut butter for them) Anyway what we did last year and plan to do again this year. At your resort you should be able to buy plain white or wheat bread(I believe it was two slices to a wax paper like bag). Then over in the conidment area for toasted bread they have butters, jams/jellies and individual things of peanut butter. We just made them fresh for our boys. That way they could have the jelly flavor they wanted and we could make it with the amount of peanut butter they prefer. Just an idea if she doesn't want the uncrustables again