In Kate Chopin’s day, ideas about the human psyche (including the subconscious) were just beginning to gain momentum. Regardless of whether Chopin was intentionally integrating these concepts into The Awakening, issues of the subconscious are definitely present in the novel as we see Edna come to terms with deeper layers of her identity. We see her acting on impulses she doesn’t understand and feeling depressed when she denies these impulses. Moreover, we can also see Edna’s "awakening" as the awakening of her true inner self that has been operating below the level of her conscious mind.
Once Edna makes a conscious decision to be guided by her subconscious, she finds greater fulfillment as a human being.