Temper tantrum policing
First her mother heard the hitting, then the crying, then the screaming to her mother for help and running to her, then telling their father to kick his ass for that.
The girl thought the world should be one giant intervention stage for temper tantrum policing, just like at home when she was a kid, even if it meant the police shooting some mentally ill guy, as long as she felt safe, nobody else mattered but her, just like her mother taught her.