It was learnt that the woman, Nor Aisah Raddani, from Kunak, sustained severe bodily injuries and died on the spot.
Another pedestrian, known only as Janah, 28, claimed she was walking behind the victim, who she said was walking slowly.
"I was rushing to my workplace in City Mall and overtook her.
However, five minutes later, I heard a loud sound and when I turned to look, I saw the woman lying on the ground," she claimed.
The victim was said to be on her way to her workplace in Giant Supermarket.
The 34-year-old driver and her child were said to be heading towards Iramanis from the Luyang direction when the 1.10pm incident occurred.
It was said that they were driving on the slow lane when another vehicle suddenly overtook them, causing the driver to swerve to the left, hitting the victim who happened to be there. The impact caused the pedestrian to get thrown several feet away.
City Police Chief ACP Jauteh Dikun said the case is being probed under Section 41(1) of the Road Transportation Act 1987.
Meanwhile, in another accident here, two men, in their 20s, sustained injuries when the Myvi vehicle they were traveling in crashed at the road divider along Likas Bay, Friday. The driver, the son of a fire and rescue personnel, claimed they were heading to KK Polytechnic in Sepanggar from the Sembulan direction when the incident occurred about 8am.
It was learnt that they were heading up the bridge towards the Sabah Foundation building when the driver lost control of the vehicle, which skidded and swerved to the divider.
The driver was assisted out of the wreckage by motorists plying the route and it took fire and rescue personnel about 30 minutes to assist the passenger out from the front passenger seat where he was trapped.
Nine personnel from the Kota Kinabalu Fire and Rescue Department, led by its Operations Chief Ismail Chala, went to the scene following a distress call at about 8.08am.
In KINABATANGAN, a minibus driver was killed and five others injured, one of them seriously, in a collision involving a mini bus and a four-wheel-drive vehicle at Km 116 Sandakan-Lahad Datu Road, Thursday.
It was learnt that the van, ferrying four passengers, was heading to Sandakan from Lahad Datu when the incident occurred at about 3.30pm.
The minibus driver, who sustained severe injuries, was rushed to the district hospital but succumbed to his injuries shortly upon arrival while four passengers were given outpatient treatment.
It was learnt that the impact caused the Toyota double-cab driver to fall unconscious and is now warded in the hospital.