The fact that Eva is surprised that no one immediately holds her responsible for Kevin’s murders reiterates how conflicted she feels about how much guilt and blame she deserves to bear. She feels guilty right away, but later on she seeks to prove to the public that she should not be blamed. Finally it becomes clear why Franklin and Celia are separated from Eva: Kevin killed them. Kevin may have left Eva alive because she’s the only member of the family that he cares about, but he also seems to have wanted to hurt and isolate her to the greatest extent possible, effectively punishing her for all the hurt she has caused him throughout his life.