How does Mrs. Mallard's health in "The Story of an Hour" by Kate Chopin affect the entire story?

1Because of her poor health, her family and friends assume that she is too fragile to endure the loss of her husband.
2Her poor health ensures that her family dearly loves her, and they mourn her surprise death.
3Her health causes her to make irrational decisions, to become overexcited, and eventually to die.
4Because of her health, everyone treats her exceptionally well, and at the end of the story, she dies happy.