The Non-Cooperation movement began on September 5, 1920 and was started by Mahatma Gandhi. The aim of the movement was for the British government to grant independence and self-governance to India. Non-Cooperation was one of Gandhi’s first large-scale movements advocating for Indian Independence. The movement began as the Indian National Congress stopped supporting British reforms after the Jallianwala Bagh massacre of 1919, in which British troops killed several hundred unarmed Indian civilians. The movement urged all Indians to stop work, refuse to buy British goods, and support Indian-made goods—all by nonviolent means. The movement was called off by Gandhi in August 1921 after a number of violent outbreaks swayed public opinion. Still, the movement lead to much broader support for Indian independence and shifted public opinion in its favor. From her autobiography and other writings of her life, it is unknown whether Haimabati Sen had any involvement in the movement, and hard to say what her political opinions would have been at this increasingly polarizing time; however, the movement did amass large support among all groups of people, so Sen would certainly have been aware of it, and is likely to have formed opinions towards the movement, whether for or against. Most people at the time found themselves pressured to choose a side, and Sen may have seen many people around her join this movement and turn away from British rule.
Sources:
“Noncooperation Movement.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., www.britannica.com/event/noncooperation-movement. “Culture And Heritage - Freedom Struggle -
The Non Cooperation Movement.” Know India: National Portal of India, knowindia.gov.in/culture-and-heritage/freedom-struggle/the-non-cooperation-movement.php.