Bhavna Parmar, 30, tried to kill four members of her family by setting them on fire when they were sleeping at their home in Bheemnagar late last night. She then set herself ablaze, a police official said.
The woman, her daughters Jyoti, 11, and Nikita, 9, mother-in-law Nanduben, 55, and father-in-law Merubhai, 60, were rushed to the hospital.
While Bhavna couldn't be saved, the four others are undergoing treatment for severe burn injuries, an official at Gandhigram police station said.
"An initial investigation has revealed that Bhavna was mentally unstable and was undergoing treatment from a psychiatrist," sub-inspector SR Varu said.
"She poured kerosene on the four members of her family who were sleeping in one room, then poured it on herself before setting them on fire," he said.
"Her husband Rajesh Parmar, who was sleeping in an adjacent room along with their five-year-old daughter, rushed the victims to the hospital, where Bhavna died," Varu said.
Further investigation is on, police added.