Who is Lady Cynthia Wickhammersely from Life with Jeeves and what is their importance?

Lady Cynthia is Lord Wickhammersely's youngest daughter. She and Bertie Wooster once had a brief romance, but they are now pals. Bingo becomes infatuated with Cynthis while tutoring her brother at Twing Hall. Lady Cynthia later becomes engaged to Reverend Bates, Reverend Heppenstall's nephew.