What does Gertrude figure out before she dies?

Before her death, Gertrude realizes the true nature of the political intrigue and betrayal surrounding her, particularly regarding the consequences of her son Hamlet's actions and the schemes of Claudius. She understands that her marriage to Claudius was a mistake and that her loyalty may have contributed to the tragic events unfolding. Additionally, she recognizes the grave danger posed to herself and Hamlet, just before she consumes the poisoned wine intended for him. This moment of clarity highlights her tragic role in the unfolding tragedy.