Who is Marie Nielsen from What Dreams May Come: A Novel and what is their importance?

Marie Nielsen is Chris' daughter, a beautiful and talented singer looking to make her mark in Hollywood. She writes a very long letter to her friend, Wendy, in which she relates her feelings about her father, and what their relationship was like. She admits that she did not spend as much time with him as her brothers did. She does write some of Chris's words, but fears them, and suspects that they are really a manifestation of her grief.