We technically did see her in one quick part of season 5 where they show the cover of her memoir, and I think she was on like a super brief part of the season 4 "between seasons" intro. They keep reminding us she is still alive in this universe but she as a character is AWOL. One of the actors I think said the show has a "we don't have to kill you off if you want to leave to do other work" policy where the actor can go in do other things while still being available to pop up here and there in future seasons. I think it's why Poole's ending in season 4 felt so weird, they decided not to kill her last second because the actress was open to limited future appearances.