I really would like to add, now that it is over that Mariah was really an evil person from the beginning that never wanted to admit it. She came outside and watched her uncle die (even though he was in the wrong). Her first thoughts about Luke Cage were can you drown, poison, or burn him? It also took very little for her to do evil. She did it with the same level of shrug that Luke did when it came to doing good. So her full embracement at the end of the series felt like a great reward.