The Rosses Community School will remain closed on Monday.
"Our condolences to the family".
"Our school community wish to offer our sincerest condolences on the tragic death of our colleague and friend, Ms Dawn Croke".
The six year-old girl has been taken to hospital in Letterkenny..
The area is sealed off to facilitate an examination of the scene by Garda Forensic Collision Investigators.
Ms Croke was a contestant in 2008.
Members of the local Mary from Dungloe International Festival organisation also paid tribute today.
The school described Ms Croke as a "wonderful teacher and friend".
One woman wrote: "Heaven has surely gained the most stunning angel of all".
A spokesman for the Gardai press office confirmed "Gardaí are investigating a fatal traffic collision at Chapel Road, Dungloe, Co".
A woman in her thirties was killed after she was struck by a auto on a Donegal road on Thursday evening. Donegal at 6.30pm on 10th January 2018.
She was taken to Letterkenny University Hospital, where her condition is not known.
The Gardaí further confirmed that the driver of the vehicle was not injured.