Moni Begum, wife of Md Omar Faruk, was arrested from her relative’s house in Dhaka’s Badda area on Friday night.
Joydebpur OC Khondokar Rezaul Hossain Reza confirmed the matter to the Dhaka Tribune on Saturday.
Earlier, two detainees -- Mostafa Sardar and Faruk -- were sent to jail in connection to the matter. They were arrested on Thursday.
Joydebpur SI Abdul Aziz said: “Moni will be produced before the court.”
Read More: 9-yr-old domestic help tortured
The child, a resident of Nayani village in Haimchar upazila, Chandpur, had been employed at Faruk-Moni residence and had been subjected to barbaric torture for nearly a year, her mother told the Dhaka Tribune on Thursday.