Daman, whose book "Strictly Personal: Manmohan and Gursharan" will be published tomorrow, said that public opinion was "transient" and changes from time to time.
But asked specifically by Karan Thapar on his programme 'Nothing but the Truth' on Headlines Today, 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".
"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".
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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.
"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.