In "the jilting of granny weatherall", what is the story's theme?

By being privy to Granny’s death, the reader can infer much about her life. The title describes the enormous hurt and humiliation that has secretly festered in her mind and heart for sixty years. Her great pride was devastated by her jilting; although she married a good man, raised a family, and managed a farm by herself after her husband’s death, she never totally got over the shock and disappointment of George’s rejection. The fact that she has saved George’s letters suggests how much he continued to mean to her in her heart and how the pain of her jilting remained with her for sixty years.

the underlined phrase is an example of : understatment

i think that the answer is a