In most cases/locations the school and/or school district does usually have the power to enforce their decision; however, if you have proof that the accusation leveled against your daughter is false, and they cannot provide information proving that it is true, you should have the advantage. The rules and regulations vary for each school district, so it would be difficult to provide you with any specifics.
In my experience as a teacher, I have learned that you need to speak to the person at the highest level, for example, the District Superintendent, if speaking to the Principal and teachers at the school has not been effective so far. Also, ask if there are any 'student advocates' who might advise you in this situation. If there is a PTO (Parent-Teacher Organization) at your daughter's school, contact the President and ask what options are available to you.
I hope all will work out in your daughter's favor.
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