The Fall of the House of Usher: What is the role of the woman in the plague doctor mask?

In the Netflix miniseries "The Fall of the House of Usher," the role of the woman in the plague doctor mask is a central mystery that is yet to be answered. The story revolves around wealthy CEO Roderick Usher, whose children have all died in seemingly unrelated circumstances. Roderick reveals that he has seen a woman wearing a plague doctor mask at the funeral of three of his children, but her identity and role remain unknown. The series is framed as Roderick recounting his story to Assistant US Attorney Auguste Dupin, and he tells three interconnected stories that shed light on the mysteries surrounding his family.The first story explains the connection between Roderick and his sister Madeline to Fortunato Pharmaceuticals. Their mother, Eliza, worked as a secretary for the pharmaceutical owner, Mr. Longfellow, and it is revealed that Madeline and Roderick are Longfellow's children. When their mother falls ill, they ask for Longfellow's help, but he refuses, leading to Eliza's death. They bury her in their backyard, but her body mysteriously leaves the casket and chokes Longfellow to death. After his death, Fortunato Pharmaceuticals passes on to Roderick and Madeline.The second story explores the Usher family's crisis when an informant threatens to expose their unethical business practices. The Usher siblings suspect each other and try to unmask the informant by presenting them with a non-disclosure agreement (NDA) during a family dinner. Madeline makes it clear that anyone found to be siding with the government will be eliminated. Despite their efforts, the informant remains hidden, and Roderick offers a $50 million bounty to uncover their identity.The third story centers around a bartender named Verna, who Roderick and Madeline meet on a New Year's Night in the past. The details of this encounter are unclear, but it is implied that Verna has had a significant impact on their lives. Roderick sees her again after receiving disturbing news from his physician,