The crash happened when she failed to give way at the intersection, he said.
A St John spokeswoman earlier said an ambulance and a rapid response unit attended, and took one patient to Dunedin Hospital with minor injuries.
Firefighters from Willowbank and St Kilda stations assisted.
A black Toyota Corolla station wagon at the scene appeared to have been T-boned by a black Toyota Highlander which had deployed airbags.
A group of nearby residents said they had been some of the first to arrive after they heard a “really loud” crash.
The Highlander had three teenage girls in it, while the Corolla had a man.
The driver of the Highlander had said “I’m 15, my mum’s going to kill me,” the residents said.
The van had been empty and was hit by the Corolla when the collision happened, they said.
Another resident said there had been two or three other crashes at the intersection in the year and-a half he had lived there.
The 15-year-old had been referred to youth aid, Snr Sgt Bond said.