Can you tell me the story of Nana Chandorkar and how he helped a devotee whose daughter was sick with a fever?

Certainly. A devotee, whose daughter was suffering from glandular fever in another village, was overcome with anxiety. The father, residing in Wandra, had no Udi and sent a message to Nana Chandorkar, pleading for him to pray to Baba and send the sacred ash. As detailed in Chapter 33, Nana received this message at Thane station. Having no Udi with him, he picked up some clay from the road, offered a prayer to Sai, and in that moment, the devotee's daughter began to recover. The father was overjoyed to learn that the girl's high fever, which had lasted for three days, subsided at the very time Nana made his prayer with the clay substitute.