I once had a big for her age, autistic, 9-year-old girl bring a huge plastic doll house down on the back of my skull as I was kneeling helping another child. I saw stars.
She didn’t even realize she did it as far as I could tell. I don’t know why she did, I don’t think she knew why.
It doesn’t matter whether she knew or not. She is dangerous and needs forced medication and institutionalization