"therefore using schedule c."

Then there cannot be Salary for her, anyway. This entity type isn't allowed to pay an owner via payroll.

"For her to use tuition remission would she also have to offer that benefit to the two teachers as well if they have children enrolled?"

This is more of a legal question for that State, really, since they are employees. As I noted, you cannot discriminate, but you can set differing benefits for Admin vs Staff. Many times this is used as incentive against poor pay rates.