Aislyn already assumed that the other boroughs wouldn’t care about her, because her father’s emotional abuse has convinced her she’s worthless. Now she is taking their understandable shock about her allegiance to the Woman in White as a rejection of her—and decides, petulantly, to reject them in turn. Her exclamation that maybe “the rest of the city” deserves to be destroyed shows that she still hasn’t grasped the full implications of the Woman in White’s mission: the Woman intends to destroy the
entire city, even if she saves Staten Island for last.