Playhouse Disney is really cute and entertaining, it features Bear in the Big Blue House, Winne-the-Pooh and friends and Roly Poly Olie. My DD's who were 2 and 6 at the time loved it. Also, the Voyage of the Little Mermaid is really good, although it is dark in there, it's very entertaining. Fantasmic is also very good, but there are some scary parts, so you'll have to decide how your kid will react. The Millionaire Game is also really fun. Even your DD will be allowed to come in and play.
At MK all the rides in Fantasyland are good for toddlers, with the exception of Snow White, that ride can be scary for some kids. Also there's the Buzz Lightyear ride in Tomorrowland that your DD will love and the International Speedway.
As far as AK, the only ride she may enjoy would probably be the safari. We tend to only spend half a day there. I know other people on these boards manage to spend a whole day there and enjoy themselves, we just don't seem to get a whole day in there, probably because we have young kids. If they were older, we probably could spend the whole day there.
At Epcot there's Honey I Shrunk the Audience, but there are scary parts, so again you'll have to decide how your kid will react. There's Living Seas which features manatees, your DD will probably like that.
I would think you'll find the most to do at MK and MGM considering the age of your DD. Epcot and AK will probably only have a couple of things that would interest your DD, but then again, that is my perspective, other people might have a totally different opinion and if they do, hopefully they'll post it so you can get different points of view to make your decision on what to do.
Have a great trip
