What happened to Kalpana Dutta after Surya Sen’s death?

In the movie Khelein Hum Jee Jaan Se, we saw that Kalpana Dutta was sentenced to transportation for life. How did the book 'Do and Die' by Manini Chatterjee came into existence? After her release in 1939, Kalpana graduated from Calcutta University in 1940 and became a part of the Communist Party of India. In 1946, she contested for the Bengal Legislative Assembly as a communist candidate from Chittagong but lost. Kalpana Dutta died in Calcutta on February 8, 1995

In 1943, Kalpana Dutta married Purab Chand Joshi, and had two sons :Suraj and Chand. Chand Joshi was a famous journalist who worked for Hindustan Times. He wrote a book called Bhindranwale: Myth and Reality (1985). Suraj Chand’s wife Manini (nee Chatterjee) wrote a book on the Chittagong Armory Raid: Do and Die, which is the base for Ashutosh Gowariker’s movie Khelein Hum Jee Jaan Se.