Sounds like she may have picked up on the adults who are doing the planning are stressing WAY TOO MUCH when it comes to Vacation and what's supposed to be a fun Family time.
Why don't you include the children in the planning? Let them be the decision makers this go round.
Sit down with them. Go over each Park, and ask them what rides or shows THEY want to see. Where THEY would like to eat.
Do this for each Park. Make it about the childrens' wants. Not the Adults.
My grandchildren are fortunate to be able to go to
Disneyland/DCA whenever they wish, but they don't like going all the time. They like it if it's a special occasion. And they've been able to go to WDW quite a bit too.
Last WDW trip was to have been a Christmas present from their grandfather and I, but he passed away unexpectedly. Was to have been a surprise.
So as a way to make it a more special trip, to keep their minds off of other things, I insisted we make it about them. They (8 and 5 at the time) picked out the attractions and the restaurants. We didn't stress about FP's. Didn't let a time-table govern our week. And we had a fabulous time. We had 80-90 deg weather the entire Christmas/NY Week, no rain, and we even got in some swimming.
A fabulous vacation - kid planned.