Ani Cherrington told Morning Report her daughter Nia also helped organise a nine minute moment of silence for George Floyd and started an online petition to highlight racial issues at the college that had been longstanding.
"We've had a lot of problems with our teachers being racist towards students and trying to force their views on them," Nia told Morning Report.
"But I think we're just trying to address the systematic and casual racism that's so present within our school and what a lot of our girls have had to deal with for years really."
Teachers have told the students "All lives matter" and spoken about scholarships for Māori.
The principal wanted posters that were tip-toeing around the issues, Nia said.
Her mum Ani says she's logged a formal complaint with the board chair.
"I am concerned about their welfare for the rest of the school year to be honest, their mental wellbeing.
"It's always been tough to be Māori at Marist anyway and I think this Black Lives Matter movement has really brought that to the fore."
RNZ has approached Marist College for comment.