Can you tell me about the woman who came to Shirdi and wanted to fast?

Certainly. Chapter 32 recounts the story of a woman, Mrs. Gokhale, who came for Sai Baba's darshan with a firm resolve to fast for three days at his feet. However, Sai Baba, being the all-knowing inner witness, was already aware of her plan. His philosophy was the exact opposite; he taught that one should first eat before contemplating spirituality. Before she even arrived, Baba had remarked to Dada Kelkar, "How can I let them remain so? Then what am I needed for?" This incident demonstrated that Baba knew the intentions of his devotees and actively discouraged the penance of fasting.