In Chapter 20, what specific problem was Das Ganu having with his commentary on the Ishavasya Upanishad, and what was Baba's unusual advice?

According to Chapter 20, Das Ganu had undertaken a project to create a commentary, the "Ishavasya-Bhavartha-Bodhini," to explain the meaning of the Ishavasya Upanishad in simple Prakrit language for those unfamiliar with Sanskrit. Although he had completed a word-for-word translation, he felt dissatisfied because the Upanishad is "full of deep meanings." The text states that he could not grasp the "internal secret" of the scripture, and his mind found no joy in the work. When he took this doubt to Sai Baba in Shirdi, Baba gave him the perplexing advice that the resolution to his doubt would come from the maidservant at Kaka’s house upon his return.