Ok, first off. take deep breaths.
second off, if you miss something, even if this is the only trip you ever take - it is not going to ruin your trip. Really, truly and I promise.
Part of the reason I am doing the split stay is that travel is a little difficult with my kiddo. If he is going to melt down, it is going to be at the end of the day waiting for transportation... so we are staying in boardwalk area for first half and MK area for second. I am planning some late nights but have some breaks built into my trip as well (2 of them). in 2014 when my son was your daughter's age he refused breaks and we went from park open til park close. we did no RD except for Jedi Training Academy day. we were just there within an hour of opening and stayed until close most of the time (fireworks). We did the Halloween party and we did AK in the morning then MK at 4pm and we stayed til just after fireworks. He is older now and has been up til midnight on special occasions so we'll see how that goes... he did stay up til the end of the DVC party (midnight) with his father in february. Throughout our trip I am gradually shifting his schedule later and later.
I also don't know that a "pool break" is much of a break. To me taking my kid in the pool is an activity. getting him dressed, getting me dressed, going down to the pool, going back up and doing it in reverse. For me this is a planned activity over two days. Between the travel back to resort and the prep time and the recovery time and the travel back to the parks that's a good 1/3 to 1/2 of a park day. Which is fine if that's how your vacation works but if you are going commando-like it's more effort than you may be imagining it is I think. That said i know it works for lots of people - for my son, the transitions are hard, so we just go til we can't anymore. All of that travel would not be relaxing for him.
Agree with
@Candycane83 about the uber strategy of going to CR and walking.