To reiterate, The Punisher is where Karen's character belongs, outside of her own series. Her investigative journalism and crazy-amazing dynamic with Frank would help spark the violent spinoff in a way that was missing in its initial outing when Karen was not present. It would make sense for her to be a driving force in the stories that Frank encounters in Season 2, since she could help him in ways that Matt would never appreciate her doing, and in ways he couldn't help himself. Because when all is said and done, Karen herself may very well be more of a punisher than a daredevil.