“Trained in ballet in her native Germany, Ms. von Aroldingen admitted that she had to unlearn much of what she knew when adapting to [New York] City Ballet’s fleet, streamlined style. Yet after Balanchine’s death in 1983, she became an expert stager of his works for other companies in the United States and abroad, and performed a wide Balanchine repertoire herself before she retired from dancing in 1984. She served as a ballet mistress in the company from 2004 to 2016.”