It comes as a parent said premeditated attacks among students at the school were being planned and announced on the social media platform TikTok.
The Otago Daily Times understands a year 9 and year 12 student were involved in an incident last week which left the 14-year-old with injuries after having her "head hit into the ground" by the older student.
A caregiver of the 14-year-old said she "pushed" the year 12 student away after she threatened her.
The 14-year-old was "grabbed by the hair", her head "smashed" into the concrete ground and the older student tried to punch her.
"She is being closely monitored for concussion after I took her to the doctor. She had grazing on her head and swelling in her ear canals."
The caregiver, who the ODT agreed not to name, said the 14-year-old had endured "continuous bullying", which involved hitting, pushing, name-calling and barging. This was the second time she had been assaulted, following an alleged incident at the school last November.
"It’s exhausting. I can’t believe that it’s happened again."
The caregiver was worried for the safety of the 14-year-old and other students.
"It’s so draining and frustrating — it’s making girls miserable.
"Life is hard enough. No-one deserves someone constantly picking at you ... I don’t want anyone else to get hurt."
The latest incident is the second in the past month, with the school previously confirming an "assault of one year 9 student on another" took place on February 13.
Police had been informed about both incidents.
Waitaki Girls’ High School principal Sarah Hay confirmed the recent incidents, although she declined to give details.
"We’re following a discipline process at the moment and we are not able to make a comment until that process has been followed this week."
The student’s caretaker said she saw a school leader "visibly upset" by the recent assault.
The leader told them this was "a horrible problem; it’s an epidemic of violence in schools", they said.
Following the incidents, Mrs Hay said it had been "a terrible time".
"It’s absolutely horrendous for all involved".
She said social media had "a lot to do with it".
"Social media is a major influence ... you want to send your kids to school to be safe. It is very challenging times," Mrs Hay said.
The ODT spoke to a concerned parent who said premeditated attacks and threatening messages online were concerning.
"I think [it’s] the most alarming thing ... I’ve seen TikTok videos where girls were laughing about the assault after it had happened and planning attacks.
"My daughter has also received threatening messages."
The parent said she had shared these TikTok videos with the school’s leaders.
