Sarkar, principal of Christ Church Girls' High School, also said she was forced to court arrest under pressure from the police and the mob.
"I had to give in to the police considering the safety of my teaching and non-teaching staff besides the hostel children who were scared," she told reporters here.
Asked about her resignation, Sarkar said she did not resign voluntarily.
"I did not resign on my own. I was forced by the mob and instructed by the police. The situation was so. I also did not want vandalism to continue", she said adding that the students wanted her to be back in the school.
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The school managing committee had not accepted her resignation.
Sarkar also charged the police with acting according to the dictate of the mob.
Arrested on September 12 in connection with the death of the student, Sarkar was released on bail on Monday.
A mob, including parents of some of the students of the school, ransacked the over 100-year-old school on September 12.