I'd just like to chime in as well here with my two cents' worth. Planning is fine, and probably a good idea when traveling with others.
In the back of your mind, just be prepared for the unexpected--rides go 101 sometimes, weather (rain) can throw off certain outdoor attractions, and a restaurant can run out of your favorite dish, etc. Plus, you have a toddler with you, and experiencing the sights, sounds and crowds at WDW is a sensory overload, even for adults at times. So she might need to take a break and chill, here and there--and that might throw off plans here and there.
Regardless, you'll have have a great time.