"Our parents have been amazing," she said.
"Some of the parents said that the children were really upset that their school had been painted on. They're upset because it's their school and they had pride in their school.
"It's more an emotional attachment to the school for the children. To see their school defaced."
She could not say yet how much the clean-up and repairs would cost.
"It's just really disappointing, because we were changing the colour of the school and working really hard to brighten it up."
Parent and PTA head Tracy Hutchins, said it was "heartbreaking" to see so much tagging.
She had shared photos of the graffiti on Facebook.
"There's a picture of a mural on there that I put up; the kids worked to do that. They've painted over that, and it's so hard to get off. They've actually taken it down."
Her 9-year-old daughter, who attends the school, "just couldn't believe how they had done something so mean to the school", Ms Hutchins said.
Senior Sergeant Shayne Wainhouse said nobody had yet been caught for the crime.