A school parent saw the girl locked in the bus and unsuccessfully tried to open the doors before an educator opened the doors.
The WA Department of Communities said the bus had been used to transport children from some pre-primary and kindergarten sites.
The State Administrative Tribunal also ordered the Childcare provider to pay $2000 in costs.
The incident occurred in May 2019.
Reference:
$15,000 Fine For Locking 5 Year Old On Bus, Aussie Childcare Network, 14 March 2020