Alcohol is thought to have been a factor in a crash on State Highway 10 near Kaingaroa School, east of Kaitaia.
The accident was just one of five suspected drink-driving incidents in the Kaitaia area in three days.
Senior Sergeant Geoff Ryan, of Kaitaia police, said the 43-year-old female driver lost control on a moderate bend 750m east of Kaingaroa School about 4pm on Tuesday. The vehicle crashed through a fence, then flipped end over end.
She was taken to hospital but her injuries were not believed to be serious.
A few hours later, just before 7pm, another car crashed on Kaitaia Awaroa Road near the junction with Ahipara Road.