“I ran between the scene waving and halting traffic in both directions,” she told the Herald.
Both Jowers and another member of the public worked to divert traffic until emergency services arrived.
“Poor lad, it was truly awful and I hope he recovers… strength to his dad who turned up about five minutes after the accident,” Jowers said.
Hato Hone St John earlier said the child was treated at the scene and taken to Christchurch Hospital in a critical condition.
The Canterbury District Health Board (CDHB) said yesterday that the child is now in a serious but stable condition.
One ambulance, two rapid response vehicles and one operations manager attended the incident.
A police spokesperson said the Serious Crash Unit had been advised.