I heard a story about Baba curing a very sick girl who couldn't walk. Can you provide the details of this incident from the Satcharita?

Yes, this story is recounted in a footnote within Chapter 33 of the Shri Sai Satcharita, as noted by R. Hari Sitaram Dixit. The incident involves the daughter of Khimji Lalji Joshi, who was part of a Punjab regiment in Palya. His daughter had been ill for a long time and became so weak she couldn't walk, with her limbs described as being like twigs. After her mother first found some relief for her by using Baba's Udi, the family took the girl to Shirdi. She was carried and seated near Maharaj, who applied Udi to her and blessed her. Within a few days, she began walking on her own. When she still had trouble getting up, she complained to Maharaj, who then gave her a fruit to eat, which completely removed that difficulty as well.