OP please ignore the rude comments here, many of those that come to this page do hope to help you with your question
As a nanny that has been on vacation with families many times in the past 20 years it can be a perk but it can also burn out even the best nanny. Please do consider giving your nanny her normal pay regardless if the arrangement may look like less working hours. Extra compensation should be added if your nanny is sharing a room and if the hours exceed normal work time. Remember you are on vacation but your nanny is not so you should sit down and negotiate all arrangements including work time, off time and accommodations, put it on paper and both sign this agreement. Do be prepared for your nanny to say no and if you have a contract then you need to follow that and not get worked up if travel was not part of the contract.
Because of past positions I have seen Israel, Paris and several, Islands, something that would have never happened on my own, so I feel super lucky, was hard work but great memories