Hi there,
My DD loved Epcot at that age - she's almost 16 now. Here's what I did. On arrival day, check into hotel and go to Blizzard Beach until room is ready , then early to bed. First full day on site we went to Magic Kingdom and did Fantasyland,Liberty Square, Frontierland and AdventureLand. The Next day we did "left" side of Epcot. Then a day at The Studios and when Animal Kingdom came on line, we added a day there. Then back to Epcot for the "right side". Another day at Magic kingdom for the remaining attractions, meaning Tomorrowland and Toontown in the morning. Then after finishing there, we would head to DTD for shopping, so we didn't have to use park time for that. She knew we would have an afternoon for shopping, so she didn't ask for everything she saw in the parks. Last day there, one more stop at Magic Kingdom for Crystal Palace breakfast - especially good if it is NOT an EMH day because it's almost deserted at the front gate. We finish breakfast just about the time the park opens. We both get a choice of one ride we just "have to do again" and then head off to Typhon Lagoon to relax until it's time to head to airport.
This schedule worked well for us. Even on the two Epcot days, there for something beside just the countries in the WS, because we incorporated different parts of future world each day. Sorry, this is probably more information that you wanted, but once I start "talking Disney" I tend to ramble
We still pretty much use this schedule, but with the extra hours at night, we may have to change it around
Anyways, have a good trip!