Their alienation is not the cause of their rage but a result of severe dysfunction in their upbringing. The perpetrators, likely her parents, took no responsibility for their actions and the child, who can't accept that the source of her disorder is her own parents, instead blame everyone else. The parents even fuel such blame because they're unable or unwilling to accept their own responsibility.
One could see the same with almost all such Leftists, some more public than others, like Greta "Scoldilocks" Thunberg.
More than likely, her mental state came from a steady diet of Tik-Tok.
It helps these jerks to think of themselves as the star of their own “MOVIE”, that's always running on a loop in their head.
They are not living or functioning in the real world