1) Here's some "feel better" pixie dust, exra strength with fast action to help you out. By tomorrow, you will be at WDW, and you won't have any work with you. Not having work helps the pixie dust to be more effective.
2) If you find it more tiring to go back to your room for an afternoon rest, consider going to First Aid. The people there are very nice and it is quiet and restful. It's a good place to go if you are just too worn out. The Baby areas (blank spot in my mind for the name) are also a good place to wind donw yourself and your child.
3) Give yourself permission to take it easy, get up late and go to bed early if you need to. You are on vacation and you deserve it.
4) Use the
scooter even if you are not feeling tired. You already have depleted your energy (working those long hours), so you need to store some up now.
5) Your little one might enjoy just doing some sitting down things like coloring books in the parks while you and DH rest and talk. Some of our most restful times were while our youngest DD was coloring.
6) Epcot's Kid Stops at each country might keep your DD busy while you just sit there watching her. They have activities like making easy stuff and coloring pages.
7) Since you are at the Dolphin, you are close to Epcot, which I feel is the most restful park and also easiest to get around with a wheelchair, etc because the paths are wide and most of the buildings have doors that open themselves.
8) There is a lot to see with all the Christmas decorations without needing to get off your scooter.
9) Save MK for the day you feel most energetic and maybe make it 2 short days there. You will need to get out of your scooter for most of the rides there. Since the rides are short, it's a lot of in and out in a short period of time.
10) Even people without any physical problems can't possibly see everything. It gives you a good reason to go back.