You just listen. Then, perhaps a few days later, when she feels much better, you try to give her the information that she needs to correct her perception. “Darling, the other day you said something, but that is not really what happened. What happened is . . .” Use loving speech when you correct her. If necessary, ask a friend who knows what really happened to help the other person understand the true situation so that she can be freed from her wrong perceptions.