How did Sai Baba use a conversation with a shepherd woman to reveal his omniscience to Sapatnekar?

Sai Baba demonstrated his divine knowledge to Sapatnekar in a miraculous and indirect way. As detailed in Chapter 48 of the Shri Sai Satcharitra, after Sapatnekar held his feet, a Dhangar (shepherd) woman arrived and began massaging Baba's waist. Baba started a conversation with her, but as Sapatnekar listened, he was stunned to realize that every word was actually his own life story. Although the conversation was ostensibly with the woman, Baba was narrating Sapatnekar's entire life, from birth until that point, even mentioning the tragic death of his late son. This event, where his personal history was told to a stranger, made Sapatnekar realize the depth of Baba's omniscience.