The committee said Ms Battersby failed in her duty to act as a conduit for the vendor and pass on all the appropriate information.
But the agent has launched a scathing attack on the authority, saying its decision was a "disgraceful abuse of real estate agents" who played a major role in the lives of Kiwis, every day.
"The research done by the REAA was of a very low standard. They didn't use all the documents I supplied and I'd say, having been a teacher for 35 years, that I wouldn't accept that standard of report writing from a 10-year-old," she said.
Ms Battersby claimed she supplied all the necessary information to the complainants but they chose to ignore them. She questioned why the buyer complained to the authority 15 months after moving in.
"I believe we need a monitoring body and support systems but not these guys. The REAA are grossly irresponsible and incompetent and need reviewing by an independent body," Ms Battersby said. "I pay them over $900 a year and all they do is abuse us. They are a bunch of cowboys who do as they please."
Ms Battersby said she would not appeal to the Real Estate Agents' Disciplinary Tribunal because it would cost her $8000 plus GST a day- money she would rather spend feeding children in Northland.
In response to her claims, authority chief executive, Kevin Lampen-Smith, said procedures for investigating complaints were robust and thorough.
"If Ms Battersby is unhappy with the Complaints Assessment Committee's decision against her, she can appeal it to the Real Estate Agents Disciplinary Tribunal."