At the scene Herewini and a witness gave conflicting accounts as to whether the girl had been buckled in.
The Advocate saw two near-empty bottles of spirits in the front seat of the Mitsubishi Lancer.
The twins normally live with their mother in Kaitaia but had been visiting Herewini in Waitangi.
The 45-year-old was remanded on bail when he appeared in the Kaikohe District Court last week charged with three counts of drink-driving causing injury. He is due back in court on April 16.
A hospital test revealed he had 122 milligrams of alcohol per 100 millilitres of blood. The legal limit is 80mg. Herewini has at least two previous convictions for drink-driving.
The maximum penalty for drink-driving causing injury is five years' jail.
Police praised the young Tutukaka woman, saying her cool head and quick actions may have saved the girl's life.
The injured child's grandmother put out a call through this newspaper to find the ''angel'' who had given the girl a chance of survival, so the family could thank her in person.
Whangarei Girls' High student Anna Goodman, 16, was identified as the rescuer. Having grown up in the Australian outback with nursing parents she was well versed in emergency first aid.