Was the school officer acting within her rights?

Your child would not go to the office as requested several times by the school officer. Your child resisted when the officer tried to difuse the potential harm by using handcuffs. So, the way I read your post, your child was posing a threat and I do not agree that your child was not threatening anyone.

You should get your child a lawyer. Your child should not defend these allegations and charges without an advocate. Maybe a lawyer can convince the prosecutor to look at the matter differently than I have.

Good luck.

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I would suggest that you hire a lawyer for your child. I would also suggest that you teach your child to obey the lawful instructions of the school staff and police. It sounds from your facts that the administrators acted properly. You and your child do not have the right to refuse lawful instructions because you have decided the child is "not threatening anyone" and the child does not want to obey.

It's not your school. If the child will not obey then the child is going to get canned.