Who is Cynthia Applewhite from Unbroken: A World War II Story of Survival, Resilience, and Redemption and what is their importance?

Cynthia Applewhite was the charming and beautiful daughter of a wealthy East Coast family. While vacationing in Florida, she met Louis Zamperini and the two embarked on a two-week whirlwind romance after which she agreed to marry him. Their marriage was rocky at first owing to Louis' drinking and troubled behavior. Cynthia threatened to leave him, but after a religious experience she decided instead to stay and try to get him to join her in devoting his life to Christianity.