Final answer:
Mrs. Mallard's revelation in the story is that she sees the flaws in marriage and her relationship.
Step-by-step explanation:
The best description of Mrs. Mallard's revelation in the story is that she sees the flaws in marriage and her relationship. She experiences a moment of realization and freedom after learning about her husband's death. This is evident when she says, 'I'm young - I'm alive - I'm a woman!'