Police said two women knocked at the victim's door, in the evening and assaulted her with a weapon, then searched her home and stole property.
The alleged offenders had gone to the Whangae Rd address and asked for petrol. They then attacked the woman, who lives alone, with some sort of weapon before taking unspecified property from the house and driving away in an older model hatchback or liftback car, possibly fawn/tan in colour, with damage to the front guards.
Police are anxious to hear from anyone who saw any suspicious vehicles in the vicinity between 6pm and 7.30pm that night.
The offenders were described as Māori, in their early to mid-20s and of medium build.
Detective Sergeant Johnson said the victim, who was injured and extremely shaken, was admitted to Bay of Islands Hospital but was discharged on Thursday.
The "extremely shaken" 92-year-old is now being looked after by family members.