An Auckland DHB spokesperson said the woman is still in a serious condition this evening.
A spokesman from nearby Godfreys said an upset customer witnessed the crash and told those inside the store what they saw.
The driver "didn't even try to stop," the customer said.
The spokesman said the roundabout near where the hit-and-run occurred is narrow with no proper signage or barriers, so people drive through the area as if it were a road rather than a roundabout.
Auckland Transport's Media Relations Manager Mark Hannan confirmed the speed limit is 50km/h in the area.
Two vehicles from St John attended the collision on Edsel St following an alert at 2pm and the woman was transported in a critical condition to Auckland Hospital.
A person working nearby claimed the woman had been struck while she was using the pedestrian crossing.
"Police were at the scene very quickly," the worker said.
A news photographer who was on the scene after the collision described the traffic around the mall and Kmart as "chaotic" but said police were controlling it "the best they can".
Emergency services temporarily closed Edsel St between Great North Rd and the WestCity carpark entrance, reopening the road shortly before 3.30pm.
Buses servicing routes 14W, 14T and 162 were detoured via James Laurie St, View Rd and Railside Ave during the closure.
ROAD CLOSED - EDSEL ST, HENDERSON - UPDATE 3 - 2:45PM
All lanes are now OPEN on Edsel St in Henderson following a...
Posted by Auckland Transport on Tuesday, 29 October 2019