If her days are discounted than just tell her that any additional days will cost extra. If you say your schedule is tight she will question that.
Example: i give a discount for teachers children but they must pay and keep their children home any time school is closed for delayed openings, vacation days, holidays, breaks, half days. I can easily see the school calender online. If they ask me to send their children during spring break than they have paid for the week already plus they would pay me again for the day. I dont feel bad about it because they get a discount all year long.

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