I think you're missing the point of the Plot Point. Vriska is not a one-sided antagonist like Caliborn, she has room for growth, both literally and figuratively. Sending her to hell is a very literal definition - she gets put through her own personal hell, having to think rationally in order to sustain relevancy outside of it. Even with that, it's pretty clear in the material provided that she struggles really hard to forgive herself and the people around her, which is why it took so long for her to hell-tier.

I think even without that trauma, she still acts very like herself post-ascension, though she is overshadowed by just how ridiculous things have gotten on the Candy characters' end. We haven't really seen her yet, cut her a br8k!