Shelly not only got her comeuppence but is now living in a hell she can never fucking escape.
Her dad not only MURDERED her boyfriend but also spent all of season 23 tormenting her and then some. From tricking the police into thinking she was a pothead and costing her a trip to a book fair she was wanting to go to, avoiding going to jail for the murders he committed, and foiling every attempt she made to shut down the pot farm.
She's in a world of hell that she deserves, for being an abusive cunt to Stan in the early seasons.