Things to keep her busy...coloring books, maybe some UNO cards, maybe a walk-man and some books on tape, a travel magna-doodle for tic-tac-toe or hangman or writing "I Love You" messages back and forth or playing pictionary, some snacks and juice boxes.
We took our laptop and ds watched a movie on it. He used his own headphones and it worked out great. DS also liked using the video camera to get some footage of outside his window---whatever to keep him occupied and he did get some neat shots of us above the clouds. His narraration is priceless!
Also, a change of clothes and any medications, any important papers.