Well, there are the birthday buttons at the WDW parks. You can get her one for the park she'll be in that day. They have them at guest relations.
Do you think she'd like a special tour? Segway is a nice one, and fun for active people.
How about a cake from the local Publix? There are really nice ones available there, and they don't cost much at all. The closest Publix to WDW is the one near Premium Outlets (from DTD) or on 192 West (from the AKL area).
If it's not convenient to travel offsite, you can get a Mickey cake at the boardwalk bakery.
There is a silly birthday hat you can get her and have her wear!
Are those the sort of things you had in mind?