She was born to prominent lawyer,
Brajkishore Prasad and Phool Devi in Srinagar in the present-day district of
Siwan in
Bihar. Brajkishore Prasad was himself an ardent
Gandhian, perhaps the first
Congress party member in Bihar, who had given up a lucrative legal practice to devote himself to the freedom struggle. She was married to
Jayprakash Narayan when she was 16 in October 1920. After their marriage,
Jayaprakash Narayan went to the USA to initially study science in
California but instead enrolled at
University of Wisconsin to study
Marxism. She moved to Gandhi's ashram where she devoted herself completely to Gandhi's wife,
Kasturba Gandhi who started regarding Prabhavati as her daughter. When her husband returned, he was regarded a revolutionary and this led to several differences with her because of her
Gandhian orientation. She had also asked to take a vow by
Mahatma Gandhi to be a celibate. Being a close associate of
Mahatma Gandhi, Prabhavati was one of the women to take part in his controversial celibacy tests. Nevertheless, the couple respected each other and jointly decided not to have any children until the country was free from foreign yoke. She was jailed by the British colonial authorities on several occasions. ==Friendship with the Nehru family==