Daman, whose book Strictly Personal: Manmohan and Gursharan will be published on Sunday, said that public opinion was "transient" and changes from time to time. But asked, if she was upset, Daman said, "It was upsetting because he had worked so hard. He had worked... it was sad that the work that he did was not being appreciated".
A series of book released in the recent past put former PM's reputation at stake
Talking about his relationship with the media, she said that the former Prime Minister enjoyed talking to them when he was the Finance Minister but the media had changed since then.
"He has not changed. It is the media that has changed. I think in those days, the media was more interested in serious issues and I think it was also much more capable of understanding serious issues," she said when asked why he had changed.
Daman added that her father enjoys "intelligent conversations".
The book talks about the life of Manmohan Singh and his wife but keeps away from the last 10 years when he was the prime minister.
Asked how Manmohan Singh would have felt when Sonia Gandhi refused to take over and selected him to be the next Prime Minister, his daughter said it was a challenge.
"It was a massive, massive challenge. I think he saw it as an honour and a privilege to take on that challenge," she said.
Daman also wished that her father would write his autobiography but steered clear from a clear answer when asked if he was indeed doing so.
"I think he should. I am not sure if he is but I think he should because there is so much wisdom and knowledge and experience that I think it would be a service," she said.
An autobiography released by former foreign minister Natwar Singh raised serious questions on Singh's authority as the prime minister between 2004 and 2014. Earlier, two bureaucrats also penned about Singh's 'weak' position in the government.