What challenge or conflict does the protagonist encounter in the story of an hour?

The conflict of this story is character vs. self. This is the conflict because Mrs. Mallard felt such a deep sadness as she first heard the news about her husband. But as she went up to her room by herself, she suddenly felt free. She knew she didn't have her husband to boss her around anymore. She felt victorious. She felt happy knowing her life was going to change in so many good ways. We know she was happy because of the way she was describing the bright spring day she was looking at through her window. As she left her room, she then realized her husband wasn't dead. She felt so disappointed, she had a heart attack and died.