A Northland police spokesperson said the investigation into the Waipū crash was ongoing.
"Our thoughts are with her family and loved ones at this difficult time," police said when releasing the name.
The double fatality has taken Northland's road toll for the year to 32 - with three more deaths than last year's total of 29.
Bunn reminded motorists ahead of the summer surge of traffic to "go with the flow" as more vehicles were expected on the region's roads.
He urged people travelling below the speed limits to be considerate and allow other vehicles to pass when and where appropriate.
"... as a driver not only are you responsible for your own vehicle but also for what's in your environment," Bunn said.
Anyone who may have seen the Waipū crash or the vehicles driving beforehand is asked to contact police on 105 and quote file number 211223/3317.