I've always brought my manual wheelchair to Disney World, and while it gave me a break from having to worry about driving in crowds, I'm hoping that next chance I'll get to go, I'll talk to my DME dealer about loaning me a folding power chair, with my seating system from my own power chair, in it. We've never traveled with my own power chair outside of the state/across country, (except to Vancouver and Woodland, Washington), because it's so rigid and HUGE!! My mom was advised by our seating/mobility specialist from the first day he delivered it to my house, of the potential damages it could sustain from an airplane, no matter how "careful" the baggage handlers are.
One reason for this, is because my fiance', Dan, is partially blind in one eye, due to his TBI, and last year when we went to Disney World, he kept running into people/running me into heavy objects, as it is hard for him to judge the distance of how close something is, to him, when he's pushing me in my manual wheelchair. We had a couple of people yell at us, especially when they realized that Dan had a developmental disability.
I'd bring your daughter's manual wheelchair, just so that she'd be able to enjoy things more, and not worry about people running into/over her.
Samantha