How did Desiree develop as a character over time in the story?

Though Desiree is presented as rather submissive, there are elements of feminism in the story. Specifically, it is the moments of agency that Desiree exhibits (confronting Armand instead of remaining in the dark) which showcase the slivers of hope for women that Chopin weaves into her narrative. Desiree could have allowed herself to stay quiet, but her love for and anger towards Armand convinced her to stand up for her love, her child, her marriage, and later on her racial purity.