Anonymous wrote:OP here - it matters because I have limited vacation days too. So, if she uses zero vacation days around the holidays while I use my vacation to take time off, I may be screwed when she uses her actual paid time off.
Then you're going to need to change to the "one your choice/one her choice" method. Giving her less advance notice of when you're going out of town would only work if she was originally thinking about being gone on those dates.
Also, you do not have to approve time off if you can't accommodate it. You may end up losing your nanny because she's gotten used to being able to turn her 1 week into two by piggy-backing on your vacations, but if it's not working for you, then you may have to do that.
Right now, there is nothing in your work agreement to prevent it, and she of course wants to get the maximum number of days off possible. Don't you?