I can understand your frustration.
What the school may do in this situation is going to be governed by the IEP. While her age does present an issue, instances like these should be covered either in a behavioral plan and / or the transitional plan, as the ability to stay on task is a life skill.
In my humble opion "just" sending her home would be an abdication of the school's duties to her and you. It would reward the behavior deprive the child the right to FAPE.
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