What was the specific story that the narrator told Sai Baba, and how did Baba react?

The source material describes the narrator telling Sai Baba a story he had just heard from Shama. In Chapter 19, this is referred to as 'that story of the old woman.' The specific plot of the story is not provided, but its powerful effect on the narrator is highlighted. He felt it was wonderful and that through this pretext, Baba had bestowed grace upon him. Baba reacted with great eagerness, leaning forward and asking to hear the whole account. After the narrator finished, Baba's mood seemed pleased, and he immediately used the moment to deliver a teaching on meditation, telling the narrator to keep the story's essence in his heart.