✤.J.
I don't have a nanny & never have, but I certainly used day care for a whole lot of years. I do know that both of the places my kids attended, whether there was a major holiday or not (also to include school cancellations for weather-related issues), I still paid the same amount. There were times when we as a family would take a vacation & as long as I submitted written notice to them within the time-frame they had set up, I did not have to pay for those periods.
In my mind, you can set things up however you see fit & based on whatever agreement you & the nanny reach and have in writing. I would think that would be someone you would want to keep very happy all the time, but maybe that's just me.
Do you mean that you've got to look for a new nanny because of this specific issue? Has she left, or are you feeling like you've got to replace her because of this?