Pesi Tuivai, 44, was travelling with seven family members, including her three-year-old daughter, from a church meeting in Auckland on Tuesday when the crash happened.
A couple and a five-year-old boy travelling in the other car were also killed and eight others injured.
Of the people who were travelling with Ms Tuivai, a 42-year-old man is in critical condition in intensive care at Waikato Hospital, and a 32-year-old woman is stable.
At Rotorua Hospital, two women are stable and two young girls have been discharged.
