Just because a school administration has the ability to supress student speech doesn't mean they are doing so lawfully. Since it's fairly difficult for a minor to bring a legal challenge, I would think the body of law that allows the rights of young people to be abridged isn't well tested.
The girl might have been acting contrary to the rules set up by the school's administration, but the school does not necessarily have the authority to make such rules. That is a possible basis for her case.
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Simple Machines in Higher Dimensions
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