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Tell her hes taking time off and that's the way it is.
It's a great opportunity for your son to prove he's up to it.Put most of the responsibility on him: Get good/excellent grades (for your son, whatever that means) and we can take some days off. Ask him straight: How important is it to you? If it's truly important, he'll do the pre-work and be in great shape to go.If not, he'll learn a valuable life lesson.That's what we did. then the outcome is up to them. Worked great for us.Best of luck.
Can always get the teachers to give you his work for the days he will be gone, then each night after the hunt, he and you can work on it. Cant think of a better addition to a great bonding experience.