is this a violation of teacher's rights?

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our school issued a order prohibiting students who are not wearing the prescribed black leather shoes from taking the quarter exam. eight students from a particular section were sent out because of this violation. it so happened however, that one of those eight was a grandchild of the school principal. so this student approached his grandpa-principal for a special admission slip. the classroom adviser received the admission slip and allowed the student to take the test. the department head of this classroom teacher heard about this incident and promptly issued a memorandum "exempting and excepting this teacher from all department activities including performance evaluation, attendance and submission of reports and lesson plan" because her action of defiance of the earlier school uniform order. worst of all, this memo of "exception and exemption" was posted in our school bulletin board for everyone to read. the teacher was asked by the head to write an explanation of her action and a promise not to do the same offense again. the teacher refused to do it. do you think such posting of the order is a violation of the teacher's rights? should the teacher just cry silently about this thing being done to her?