[4][5] In late 2003, Petrie returned to New Zealand and joined TVNZ, initially as a fill-in presenter across all One News bulletins.
She was on air when the Boxing Day tsunami took place, as well as during the 2005 London bombings; for this, as well as her earlier reports on the September 11 attacks, she was jokingly dubbed a 'disaster magnet' by former boss Bill Ralston.
[6] In 2006, Petrie became co-anchor of the 6pm edition of One News alongside Simon Dallow; she replaced Judy Bailey as the primary female anchor, who had held the position for 18 years.
[6] In mid-July 2020, it was reported that Petrie would be stepping down as co-anchor for One News in early August 2020 as a result of a job restructuring caused by the COVID-19 pandemic in New Zealand.
[7][8] On 14 August, it was reported that TVNZ had delayed Petrie's departure at the last minute and that she would continue to present 1 News at Six evening bulletins during Auckland's Alert level 3 lockdown.