Although I do think your daughter would probably prefer Magic Kingdom and Animal Kingdom, there are also several attractions at Epcot that she will enjoy as well! My 4 year old actually appreciates Epcot as much, if not more than the Magic Kingdom.
Her favorite attractions are The Living Seas, where she can board an undersea clamshell to search for
Nemo, and even spend some time talking with Crush the turtle in the interactive attraction
Turtle Talk with Crush. She also loves riding Spaceship Earth, the spherical centerpiece of Epcot. She loves spending time in Innoventions West and East and particularly enjoys The Great Piggie Bank Adventure and Where's the Fire exhibits which provide hands-on interactive fun!
The Character Spot is a unique place where your little one can meet several of her favorite Disney characters all in one convenient location, and speaking of characters, some of the beloved Disney Storybook characters are available to meet with visitors in various areas of World Showcase! Some of these include Belle and Beast, Aladdin and Jasmine, Marie from Aristocats, Mary Poppins, Alice, and even Winnie the Pooh and TIgger.
While in World Showcase, my daughter LOVES exploring the Miniature Train Gardens near the Germany Pavilion and also has a blast stopping at the
KIDCOT Fun Stops at each country!
In addition to all of this, Epcot features a wide
variety of entertainment suitable for all ages and to top it all off, the amazing laser and fireworks show, Illuminations: Reflections of Earth.