"She launched her new book in the hospital last month. Despite her ill health, she was always discussing arts, creative processes and life," Khanna added.
Born on February 18, 1925, Sobti had won the Sahitya Akademi award in 1980 for her novel "Zindaginama".
She was also conferred with the Jnanpith in 2017 for her contribution to Indian literature.
Sobti was best known for her 1966 novel "Mitro Marajani", which talked about a married woman's sexuality. Her other acclaimed works include "Surajmukhi Andhere Ke", "Yaaron Ke Yaar" and "Daar Se Bichchuri".