Ahhh.... this is tough.
This is just a crazy thought, but do DtD resort hotels offer shuttle service to Universal parks? If so, you could use them!
You can really do a Universal park in a day. Islands of Adventure is comparable to MK, and Universal Studios is comparable to DHS. IoA has some big thrills, but I think I'd still recommend it. Universal Studios is in a lot of aspects outdated. Your DD might not understand a lot of the movie references (still enjoyable, though). IoA has the adorable Suess Landing, which is where I would spend all of my time. There's some shows and three huge, interactive playgrounds.... also a few "dark" rides (errr.... one, really).
Universal/IoA are really geared towards thrill-lovers. I'm not sure how much there is to do for someone who doesn't enjoy that sort of stuff. And the minimum height requirement is 54" for both rollercoasters and 52" for Dr. Doom's Fearfall, so even if DD was a coaster fan, I wouldn't think she'd be able to get on.
Definitely look for special events happening at that time.