The behavior of a little girl killing a hamster is very frightening. It feels like her focus is not on the torture, but on the form of revenge on the other party. This form is unhealthy. I guess that the reason why she tortures and kills animals is not because she likes the pleasure of killing itself, but because she enjoys the pleasure of completing such extreme revenge.
Posted on social platforms, you may not only show off the torture, but also show off your own strength and tell others that this is bullying you. In the end, I won't be easy to mess with.