What lesson was taught to the woman who wanted to fast, as previewed in Chapter 32?

The introduction to Chapter 32 outlines a fascinating story about a female devotee who had resolved to observe a strict three-day fast upon visiting Sai Baba. However, her plan was upended in a way that taught a profound lesson. The chapter explains that her firm resolve was broken when she was not only made to prepare puranpolis but was also made to eat them to her heart's content. The key lesson, as highlighted in Chapter 32, is that 'wearing out the body for others' sake - this blessed act is true welfare.' This incident was designed to make her understand the virtues of service and selfless action over rigid personal austerities, a lesson she would never forget.