Hi Elizabeth!
What a wonderful age for your little princess to visit Walt Disney World (WDW)! There is something for her at every one of the WDW parks, but I have a few tips for the parks to visit and the itinerary to make her visit magical. I suggest the following:
Day 1 - Magic Kingdom Visit Magic Kingdom on the first day because this park has the most experiences that she will love. Visit Fantasyland in the Magic Kingdom in the morning and ride
The Many Adventures of Winnie the Pooh,
Dumbo the Flying Elephant and the
Prince Charming Regal Carrousel. Hopefully you are staying on site, so you can easily go back to your room midday for her to take a nap. Go back to Magic Kingdom at night and hit up the Country Bear Jamboree and make sure she gets to watch the parade and Wishes.
Day 2 - Hollywood Studios At Hollywood Studios she will love
Disney Junior - Live On Stage! and the Voyage of Little Mermaid. Consider having a character dining experience at Hollywood & Vine.
Day 3 - Animal Kingdom If your little one likes animals, this is a great park for her! She will love the Kilimanjaro Safari and Affection Station. Consider leaving the park midday and enjoying the pool at your resort for the remainder of the day, as little ones love splashing and playing at the pool.
I hope you have a magical vacation!
Magically,
Stacy