He or she would not have to "earn" it per a contract. Either she get's it or she doesn't!  If a person is humane, they will give it to her, because what person in there right mind would have a maid be working while everyone else is enjoying time with their families.  She is a maid... not a doctor.  Doctor's are need pretty much 24 hours a day.  My job requires someone to be on duty 24 hours a day as well.  Why would you NEED to have a maid working on holidays?