Alexandra Bergson.
In one work, this author's spiritual crisis is fictionalized in Myra Henshawe, who realizes that human love is inadequate. In a different work by this author, Marie Shabata has an affair with Emil, whose sister becomes a successful farmer even though she's a woman; that character is (*)  Alexandra Bergson. In yet another work by this author, after marrying Cuzak, the title character became the mother of a large family on a Nebraska farm. For 10 points, name this author of  O Pioneers! and  My Antonia.
In one work, this author's spiritual crisis is fictionalized in Myra Henshawe, who realizes that human love is inadequate.
Willa  Cather