Can you give me a summary of the incident involving Sapatnekar and the Dhangar woman in Shirdi?

Certainly. The incident with Sapatnekar, described in Chapter 48 of the Shri Sai Satcharitra, begins with him in deep despair. He was repeatedly turned away by Sai Baba with the words "Chal Hat." Believing his karma was to blame, he nonetheless resolved to stay in Shirdi until he received grace. One night, he seized a moment when Baba was alone to fall at his feet. Just then, a Dhangar (shepherd) woman arrived and sat down to massage Baba. Baba then began a long conversation with her, but the topic was miraculously Sapatnekar's own life story, complete with intimate details like the death of his son. Hearing his entire life narrated by Baba left Sapatnekar in awe, cementing his faith in Baba's divine, all-knowing nature.