Why does Louise mallard die from happiness?

In Kate Chopin's "The Story of an Hour," Louise Mallard dies from happiness because she experiences a profound sense of liberation upon learning of her husband's death. Initially grieving, she soon realizes the freedom and independence that come with his absence, envisioning a life of autonomy. However, when her husband unexpectedly returns, the shock of his presence overwhelms her, leading to her sudden death—a poignant commentary on the constraints of marriage and the complexities of female identity in the 19th century.