Her comment about “someone will live, someone will die” was talking about the scarcity of organs - in other words, someone will get a lung and live, and someone else will not get that same lung and may die as a result. I don’t think she was proving that she believes herself to be the sole arbiter of life and death; to the contrary, I understood her comment as saying that it was a difficult situation, and she did NOT want to intervene and be the person who decides who lives and who dies.