The writer gives quite a few clues related to Mrs. Mallard’s heart trouble. When she was informed about her husband’s death, “she wept at once”. Unlike the other contemporary women who could not believe it, she accepted the fact immediately. It’s the beginning of her change.
Alone in her room, she looked out of the window and saw the “new spring life” outside. She sensed “something coming to her and she was waiting for it, fearfully” and tried to “beat it back with her will” as “her bosom rose and fell tumultuously”. A whispered word “escaped” her lips when she “abandoned” herself: “Free!” At this moment, “her pulses beat fast, and the coursing blood warmed and relaxed every inch of her body.” She was cheered up by the coming freedom and became excited.
She recalled the life with her husband, which was “fixed with gray and dead”. And she began to imagine the days ahead of her, in which “she would live for herself” absolutely.
She put off her sister Josephine’s “imploring” and “her fancy was running riot along those days ahead of her”. She became optimistic and even over-excited. “There was a feverish triumph in her eyes,” A new woman, with freedom and hope was born, “like a goddess of Victory”
At this stage, she thought she could grab the freedom, which triggered her heart trouble. Her pulses beat fast, the blood ran riot throughout her body and she was feverish. These changes hinted that her heart might not bear this “joy”.
Mr. Mallard’s