My $0.02... there is a very real chance that your daughter will be bored to death with two days at Epcot. For our kids (aged 10 and 7 on our trip), Hollywood Studios was their second favorite park behind the Magic Kingdom. We abandoned our Epcot plan mid afternoon, went back to the room for pool time and dinner, and then used our park hopper to go to the Magic Kingdom. Our kids didn't really like Animal Kingdom either, other than the shows..but we have a really awesome zoo at home, so most of those animal related exhibits rated a big "meh". So you may have a completely different experience.
My suggestion is to try to make sure you get as much of your top Epcot highlights into the first day, and then use that to gauge your plan for the 2nd day. Since you have a park hopper, you might consider hopping over to HS as your backup plan. Lots of shows and experiences to enjoy at HS, even if the actual number of rides is pretty low.
And, of course, your initial feelings might be absolutely correct and your family will love two days at Epcot. There is no right way to do Disney for everyone.