Ariadne

Like, yes Shauna saw Jackie as a villain who was ruining her life— when Jackie was alive

Not after she died. When Shauna sees ghost Jackie for the first times immediately post-mortem, Jackie is happy and fine with playing games in the meat shed. She gossips with Shauna and they laugh together

Jackie being mean happens after Shauna has done bad things, like eating her ear (“What did you do with my ear Shipman”), or when she is actively hunting down Coach Ben. Ghost Jackie grows meaner as Shauna becomes worse. And subconsciously believes that she deserves punishment.

Ghost Jackie is her subconscious, and the manifestation of her guilty conscience

By the time she returns home, Jackie is immortalized by her parents and Wiskayok as a whole, which messes with Shauna’s perception of Jackie in a different way

Jackie isn’t the big bad villain, she’s Shauna’s victim, Shauna’s the monster who brutally killed her and ate her remains after betraying her in the worst ways possible

Shauna’s psyche doesn’t revolve around Jackie being the bad guy anymore, she is the monster now, and she internalizes that belief in order to cope with her trauma

I mean

Or Shauna telling Callie that she thinks of Jackie every day. Or her insistence on showing up to Jackie’s house on her birthday to be ripped to shreds. It’s evident that Shauna does not view Jackie as a villain who ruined her life anymore

It doesn’t fit with the way she acts in these moments

It’s easy for Shauna to see Jackie as a virtuous victim of her monstrous behavior, especially when Shauna has Jackie’s innocence and angelic persona rubbed in her face everywhere she goes, from the statue to the ceramic bunnies, to Jackie’s parents and their surface level knowledge of her daughter over the course of two decades.

That will change your perspective and it requires the way that Shauna views Jackie and the way she views her in adulthood