In "Daisy Miller", what is gained by having Daisy die at the end of the story?

Henry James' novel "Daisy Miller" is a commentary on society in general and on women in particular.  Daisy is a victim of her society.  She is trapped.  Being held back by the standards imposed on women, she is not able to grow intellectually.  In traveling abroad, she is forced to adhere to social standards that are even more strict than what she experiences at home.  Men are attracted to her because of her outgoing nature - however, it is her outgoing nature that makes her the victim of gossip and disapproval, making her unsuitable for men.  In order to stay critical of a society that so represses women, James could not allow Daisy to succeed in the end.  Her death represents to the full extent her victimization.