Hi Belinda,
Make*A*Wish is such an amazing organization and I'm so happy they were able to do that for your daughter. The parks can be very big and intimidating to younger kids, especially those that are under additional stress for some reason. The next time she visits, you may have a hard time getting her off the rides.
I understand the importance of keeping her physically comfortable.
The average high temperature in April is 83.0 and the average low temperature is 59.4.
In May the average high temperature is 87.8 and average low temperature is 65.9.
Keep in mind that these are average temperatures so it can vary either way. If you could some how plan a trip for earlier in the spring or later in the fall, you may find the temperatures a little more forgiving. I'd try to avoid traveling around Easter and Memorial Day if you can as these times are typically more crowded.
Click
here here for some tips to help beat the heat in case you have to travel when the temperatures are warmer.
I'll send prayers and positive thoughts for your return Princess Vacation. There's no better place to be a princess than at Disney World. Wishing you many magical memories :-) Allison