She alleged that she has been isolated and humiliated by fellow inmates of the convent.
The SOS alleged that the police failed to act in the sexual harassment charges levelled against the former Jalandhar diocese Bishop by the nun, who is also a key witness in the 'nun rape case'.
Nuns doubt Bishop Franco still wields power in the diocese.
Franco Mulakkal, accused of raping a nun several times between 2014 and 2016, is currently out on bail.
The protest led by the nuns and Catholic reformist forums in Kochi in September had led to a public outrage and demands for action against the bishop.
The Bishop will have to surrender his passport and his entry to Kerala will be restricted.
"The first phase of interrogation is over. He has been asked to be present tomorrow morning at 11 am for continued interrogation. He has agreed to it," Kottayam Superintendent of police Hari Sankar said after the marathon questioning of the priest.
Bishop Mulakkal, a senior member of the Roman Catholic clergy in India, was arrested last year following allegations by the nun that he repeatedly raped and sexually assaulted her at the Kuravilangad convent between 2014 and 2016, a charge denied by him.
The nuns -- Alphy, Anupama, Josephine and Ancitta -- were served notice by the superior general of the congregation, Regina Kadamthottu, urging them to take up their assigned responsibilities as befitting members of the Missionaries of Jesus congregation.
The 54-year old Mulakkal was arrested by Kerala police after intense interrogation in Kochi over the last three days.
She alleged that by continuing in the position of Jalandhar diocese Bishop, Franco Mulakkal and his close associates "are using the wealth of the diocese to divert" the course of the police investigation.