Police said today the child Pranita Santra had died of hepatitis B at the Calcutta Medical College Hospital on December 27.
Her mother Rina (40) claiming that the child had spoken out while being taken to her home at Raghudebpur, had taken her to a priest at Gadiara, known in the area to practice witchcraft, the next day.
Police stepped in yesterday evening as the news reached it and took away the body for cremation.
The woman has two other children and Pranita was the youngest. Her estranged husband, too, believed in the priest's alleged assurances.
No arrests were made as there were no complaints, the police said.