Can you explain the story of the fasting woman as previewed in Chapter 32 and its underlying moral?

The introductory part of Chapter 32 outlines the story of a woman who had a strong desire to visit Sai Baba and observe a strict fast for three days. However, the narrative explains that an occasion arose which broke her firm resolve. Instead of fasting, she was made to prepare and eat puranpolis to her heart's content. The moral of this incident, as highlighted in Chapter 32, is that 'wearing out the body for others' sake - this blessed act is true welfare.' This suggests that selfless service and fulfilling one's duties can be a higher form of spiritual practice than personal austerities like fasting.