if she likes plants..flowers...anything like that..even cooking, take her to the "behind the seeds" tour at the land in epcot. you get to walk in the greenhouses and see plants up close. its really cool and its only $14 a person. it only takes an hour and if you love plants or just learning in general its a great experience.
i deffinitley agree with everyone else, be sure to check out that world showcase. since she's a teen, point out to her the traditional attire you can find in china, japan, and morocco. youd be surprised what she could buy that could look fabulous even with a pair of blue jeans. they also have make-up in france as well as perfume there and in italy. let her eat her way around. try a dessert there, a little bit of "something" somewhere else.
i also agree with letting her help plan. and if she likes to be involved...even a little bit, with her siblings, let her be the one to take them to the kidcot funstops throught the park. she can help them color a mask and have one of her own. it sounds childish, but ive found it brings you a little closer to a child by doing something together.
i feel like im forgetting something totally important. i'll think of something later and feel silly xD.