Rachelle Miller, former staffer to then-human services minister Alan Tudge, has given evidence the media interest as people complained about receiving debt notices in January 2017 was mixed, initially manageable but quickly became something the prime minister's office wanted shut down.

A media crisis was brewing in "left-wing Canberra circles", fueled by "vindictive journalists" who had stopped behaving according to ethics, she said.

However, outlets she described as "right-wing", including the Murdoch press and commercial broadcasters, were sending a message the Coalition government was "cracking down on welfare cheats".

"We were getting feedback from the prime minister's office that actually this was playing quite well in in your marginal seats," Ms Miller told the commission on Tuesday.

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Ms Miller said the media strategy she had developed to provide counter-narratives was not working to quell the negative stories in the outlets she described as left-wing.

Frustrated at being unable to respond to the media reports she felt were inaccurate due to privacy laws, she said they found a "loophole" in the laws that allowed the government to release personal information on individuals in order to correct the record.

Some of the cases being reported were not actually robodebt cases, but had debts raised through non-automated processes.

Mr Tudge was under pressure from the prime minister and applying similar pressure on his staff to find these cases and have them dealt with quickly.

"Plan A wasn't working so we're going plan B or plan C," she said, referring to releasing personal information on those complaining through the media.

"In a media strategy, it becomes a risk. I retrospect it's not something I would do again."

Under questioning by a lawyer for the Commonwealth, Ms Miller confirmed that approval of the plan to release critics' private information to quell the media crisis had final approval from Mr Tudge.

Media reporting on suicides linked to robodebt were investigated by the department and personally looked into by Mr Tudge, the adviser said.

Those investigations found some of the reported deaths had debts that were from robodebt and some weren't.

Asked about the culture in the minister's office, Ms Miller said they were focused on ensuring integrity of the welfare system, and ensuring all debts were collected rather than taking a welfare or counselling view of people who needed it.

"But we were very deeply upset that someone was taking their own life," she said.

Ms Miller said she was inspired to contact the commission after listening to earlier evidence given by robodebt victims and realising the damage to people that had been caused by the scheme.

"It really upset me."