On Tuesday, emergency services were called to a Wells Rd crash involving a vehicle and pedestrian around 8.40am, where they treated one patient.
The girl was rushed to Starship Hospital in a critical condition.
Eades said the school has been flooded with well-wishes from colleagues and the community, and was addressing what had happened with students.
"Our teachers are implementing useful and practical strategies to maintain student wellbeing at this time."
The driver, a 77-year-old man, was forbidden from driving after the serious crash, but a police spokesperson said any further decisions around his eligibility for driving would be for Waka Kotahi NZ Transport Agency to make.
The school remains open, but the driveway and visitor parking at the Wells Rd entrance is closed for the forseeable future.
The Police Serious Crash Unit are investigating and Waka Kotahi has been approached for comment.