I was under the impression your sister lived there. Anyway--is it workable to have your daughter come back as unaccompanied minor? You can bet she'll have a better seat than she'd get on Sun Country!! BTW--how old is she? Is she returning the same time as your sister and her spouse?
1979 is about the last time I went--or 80-something to see the beau I met in Grand Cayman...ah, the olden days...NAH I had to buy tickets then!