Who is Ehrengard from Anecdotes of Destiny ; and, Ehrengard and what is their importance?

Ehrengard appears in Ehrengard. She is Princess Ludmilla's maid-of-honor at the hideaway at Rosenbad. Ehrengard is the daughter of a military man, and her brothers are all in the military, as is her fiance. Kurt. Thus, she is unprepared when confronted with the subtle wiles of the artist Herr Cazotte.