The most supported inference from the passage is:
Mrs. Mallard was not happy in her marriage to her husband.
This inference is drawn from the context of her reaction to her husband's death. While she does experience grief, the passage highlights her feelings about the future and the sense of freedom she anticipates, which suggests a complex emotional state regarding her marriage. The text emphasizes her welcoming of a future that "would belong to her absolutely," implying a desire for independence rather than depicting a purely sorrowful reaction to her husband's death.