What happened that changed things for Penelope during the fourth year when she was fooling the wipers by weaving the robe?

During the fourth year, Penelope cleverly deceived her suitors by weaving a robe and claiming she would choose a husband once she finished it. However, she secretly unraveled her work each night, stalling for time. This strategy changed when her trick was discovered, leading to increased pressure from the suitors and highlighting her desperation to remain loyal to Odysseus. The revelation of her deceit intensified the conflict and urgency in her situation.