Members of the Epsom Girls team were washing their boots when a Tangaroa player approached one of the girls. The Tangaroa player started yelling at the Epsom player before punching her.
"There was a bit of verbal abuse beforehand and then after that there was hair-pulling and punching. It was all pretty horrible," the woman said.
A male spectator ran towards the pair and dragged the Tangaroa student away.
The woman said a formal complaint had been made to Tangaroa College by an Epsom parent.
"One of the Tangaroa head boys came up to [us] later and apologised for what happened," she said.
Epsom Girls' principal Madeline Gunn was unavailable for comment yesterday and Tangaroa principal Ngaire Ashmore did not return messages.