So why did she suddenly close?
Detractors say the Radia tapes leaked last year dented her image in a business where reputation matters more than anything else.
Her conversations with journalists, bureaucrats, businessmen and ministers created the image of an all-powerful lobbyist.
What stood out in the conversations was her anxiety to get A Raja, who had got fully embroiled in the 2G spectrum controversy by now, the telecom ministry after the United Progressive Alliance came back to power in 2009.
(Ratan Tata would later admit that he had a "chemistry problem" with the other candidate for the post, Dayanidhi Maran.)
Raja indeed got the job.
Journalists dismissed their conversations with Radia as casual banter to extract information from her.
Her role in the controversy was also examined by the Central Bureau of Investigation and the Enforcement Directorate (for violation of foreign exchange laws).
Both the agencies gave her a clean chit, but the damage had been done.
"What matters is the perception, not the reality. Rajat Gupta might not be found guilty by the Securities Exchange Commission (for passing on insider information to Raj Rajaratnam of Galleon) but which company will re-induct him on its board?" asks a public relations veteran.