The former principal of elite Sydney girls' school, Kambala, is suing the school and two teachers for defamation following her resignation, which came after more than 100 teachers signed a motion of no confidence in her.
Debra Kelliher left the Rose Bay school in April after some teachers and parents complained to the school council about her leadership.
At the time, the school council, headed by prominent businesswoman Sally Herman, wrote to parents to tell them Ms Kelliher had resigned effective immediately after doing a "wonderful job" at the Anglican school during her 3?? year tenure.
But Ms Herman's letter annoyed some parents and teachers.
In a letter to parents on Wednesday, the school council said: "The school and two members of the teaching staff are the subject of a defamation proceeding by the former principal, Ms Kelliher.
"Please be assured that this matter is being handled by our lawyers and the School Council. Our principal, Shane Hogan, continues to work with our teaching and administrative staff to ensure that our girls are not affected and are receiving the best academic leadership possible," the letter said.
"As the matter is before the court, we are not able to provide you with any further information at this time."
It is understood Ms Kelliher resigned after a staff meeting on the last day of term one, in which some teachers raised concerns about her, including what they felt was high staff turnover during her time at the school.
The Kambala Parents' Association also circulated a letter to parents at the time.
It is understood the school disputes that the level of staff turnover was excessive and claims it was lower in 2016 than the average turnover for independent schools.
The matter is listed in the Supreme Court for argument on Friday.