When I go on holidays, my housekeeper still comes and uses this time to do all the things she can't really do when the children and myself are around. She has the keys, she knows what she needs to do so she gets on with it.
If she doesn't come, I don't pay her. I always want her to come especially when I am not here so when I come I know that she has actually done every single corners, skirtings, and so on
and hoovered under the furniture
I double her money at Xmas plus I give her a bottle of champagne and I give her a little bit more when she goes for 4 weeks in the summer.
BTW, she off for all of august so I would love if you could recommend someone to take her hours (6-7hrs a week) whilst she is away...