What specific problem was Das Ganu facing with the Ishavasya Upanishad, and what did Sai Baba tell him to do about it?

In Chapter 20, Das Ganu was working on a commentary called "Ishavasya-Bhavartha-Bodhini" to explain the Upanishad in simple Prakrit language for those who didn't know Sanskrit. His problem was that although he had translated the text word for word, he could not grasp its deep internal meaning or "internal secret," which left his mind without joy or satisfaction. When he took this doubt to Sai Baba in Shirdi, Baba did not explain it himself. Instead, as mentioned in Chapter 20, Baba told him, "The resolution of this doubt of yours will be done by the maidservant at Kaka’s house When you return there."