In the books, the war of the boy king is Catelyn’s story, subverting tropes of the dashing young hero who beats the odds and triumphs over all. She adds an emotional level to the story, as the mother who worries for her children, but she’s also a strategist and deeply pragmatic. She’s one of the few figures who realizes that they’re not merely playing at war, and understand what that must mean. In the show, however, Catelyn is merely the mother of the king, and no one wants to see what the mother is thinking or doing when the true hero is elsewhere.