Supritendent of Dasna jail Viresh Raj Sharma, where Nupur is lodged, said she had told him about her wish to write the book.
He said that under jail manual, he was not empowered to grant permission for writing or publishing books of jail inmates and only a District judge can allow this.
However, the jail administration can provide her with stationary in case a written permission is granted by the judge, he added.
Sharma said the dentist is teaching jail inmates, including women, since she has been lodged in the jail on April 30.