Passage: Nietzsche and Salomé spent the summer together in Tautenburg in Thuringia, often with Nietzsche's sister Elisabeth as a chaperone. Salomé reports that he asked her to marry him on three separate occasions and that she refused, though the reliability of her reports of events has come into question. Arriving in Leipzig, (Germany) in October, Salomé and Rée separated from Nietzsche after a falling-out between Nietzsche and Salomé, in which Salomé believed that Nietzsche was desperately in love with her.

Question: What was Nietzsche's sister's name?
Elisabeth