Yes, the trip planning dvd is great - and it's free! We are taking my kids' godfather to wdw for his first trip, and we let him watch that and choose what resort he wanted to stay in (he chose two so we're staying at both!). He had a very hard time visualizing how big it was and what the parks were like until he saw the video.
Also, make sure she has sunscreen, sunglasses, comfy shoes and some kind of backpack/hip pack (not a purse) to take to the parks with her. Remind her to pack layers (unless it's the middle of summer). I think the Complete Guide to Disney World is a great get-excited, and informative book. It's a little pricey for the newest edition, but you can probably find a used one from a couple years ago on amazon or ebay for pretty cheap. The info. would be generally the same.
On a side note, the godfather said to us the other day, "I've been watching the Disney channel to prepare for Disney world, and I can't figure out how they put stuff from all those shows into the parks." We cracked up! and we told him disney channel has virtually nothing to do with wdw (thank heavens!).
