We are both out of routine. We talked about this today. When she is at school she knows that certain things happen on certain days. But over the school holidays the drama club, cookery club and brownies etc don't happen. So she cannot pinpoint days. I find the same because of the way I use my two weeks holiday over the summer (by taking odd days off to make long weekends) and even I have to think twice about what day it is.
So I need to sort out a way of dealing with this for next summer holiday.