Vriska is reaching her tipping point here. She is envious of Terezi because even without a lusus or sight, Terezi still rises. And she is envious of Equius because he can do what he wants with a lusus to care and tend to him.

While she is forced to scrap and etch out her own life with a guardian that could kill her at any time.

It’s hard, to just see her lashing out like this.