Hi!
I have a 5 year old son and he absolutely enjoys the Magic Kingdom and Disney's Hollywood Studios. I suggest concentrating on those two theme parks first and then visiting Disney's Animal Kingdom and Epcot in that order. With a young child, I especially recommend visiting Fantaslyand in the Magic Kingdom and enjoying Toy Story Mania in Disney's Hollywood Studios first thing in the morning. However, all of the theme parks have attractions and shows that very young guests generally enjoy.
Be careful with some of the 3-D movies. My son loves Mickey's PhilharMagic in the Magic Kingdom, but is terrified during "Honey, I Shrunk the Audience!" in Epcot and "It's Tough to be a Bug!" in Disney's Animal Kingdom.
I recommend getting to the parks early, about 30 minutes before their posted opening time. I also recommend that guests leave the park around lunch, especially with young children. Relax back at your hotel; take a nap or go for a swim! If your daughter is anything like my son then know that you might be spending a lot of time at your hotel pool; sometimes I think my son can spend the entire vacation in the pool! Then come back to the parks around dinner time. The parks are absolutely beautiful at night and should not be missed!
Also be sure to make some Advanced Dining Reservations (ADRs). My son loves Disney Character Dining. His absolute favorite is Chef Mickey's in Disney's Contemporary Resort. My whole family enjoys the Whispering Canyon Cafe at Disney's Wilderness Lodge. It's great family fun and good food at the same time! ADRs can be made
here.
Have a magical vacation!