Acting Senior Sergeant Dave Scott said the Woodhaugh Rest Home resident was crossing the road on her mobility scooter whenat 11am she was hit by the vehicle, which was turning right into Howe St.
She was taken to hospital and underwent surgery.
Acting Snr Sgt Scott said it appeared the driver had failed to see her.
The sun "may have been an issue" and police were appealing to any witnesses to contact them on (03) 471-4800.
The serious crash unit was investigating but it was too early to say what, if any, charges would be laid.