sorry to be obtuse, but why isn't arya coming back to winterfell again? I legitimately don't get it. She just killed Death Himself, so why would killing Cersei be a suicide mission for her? If she's one of the last Starks and that's so valuable to her then why did she peace out permanently?

Maybe hoping to kill Cersei and do what she can to put Jon on the throne and stay to protect him....or something? i really have no clue.