Sister Christie, spokeswoman for the congregation, made the announcement a day before its general chapter was scheduled to end. It began on 1 February at a place some 30 kilometres from Kolkata, headquarters of the Missionaries of Charity.
The nuns wanted to re-elect Sister Nirmala to a third term but she requested to be relieved of her duties, citing ill health and a desire to live a contemplative life in the congregation.
At the general chapter 163 nuns cast their ballot, 74 from India and the rest from countries where the Missionaries of Charity are present.
Along with the new superior general, Sister Joseph was elected as assistant superior general and first councillor. Other councillors include Sisters Joanna, Adriana and Joseph Maria.