We hit Blizzard Beach (water park) one day and it was a blast.
Other than that we just hit the park early and got "fast passes". In the middle of the day we did all the non ride stuff - train, parades, shows then hit the rides again as the lines died around 8pm.
If you do the train get her to the very back and she can stand there with the conductor. they will let her say "all aboard" on the radio. That made my daughters afternoon.
Have fun buddy! I am off to Easter Dinner with wife, daughter and inlaws. No expectations except that it will be great food!