"I had never thought that magic truly existed in this world..." It was something that citizens would mention, often associated with witchcraft and heresy, but Elisabeth never truly believed it, only thinking it to be senseless rumors spout around the community. However, she trusts März; she has no reason to doubt him, so if he says that magic exists and that he's used it, then she can do nothing more than take him at his word, even if she feels a sense of incredulity. "...Pardon, this is just...well, it is a lot to take in, is all."
no worries!