Could you tell me the full story of Khimji Lalji Joshi's daughter and how Baba healed her?

Certainly. The story is detailed in a footnote within Chapter 33 of the Sai Satcharita. Khimji Lalji Joshi's daughter had been ill for a long time and had become extremely weak, with her limbs like twigs, and she was unable to walk. Her mother first acquired some of Baba's Udi, which gave the girl some initial relief. The family then brought the daughter to Shirdi. She was so weak she had to be carried and seated near Sai Baba. Maharaj applied Udi to her and blessed her. Miraculously, within two to four days, she began to walk on her own. However, she still had trouble getting up and sitting down. When she complained to Baba about this lingering issue, He gave her a fruit to eat. From that moment on, her difficulty was completely gone, illustrating a multi-stage healing through Udi and Baba's direct blessing.