Brendan Geoffrey Johncock, 42, of Leslie St, South Launceston, has admitted that he had a sexual relationship with the girl but maintains it was consensual.
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The woman yesterday told the Launceston Supreme Court how she drove her daughter's car to a meeting with Brendan Johncock to deliberately intimidate him.
"I parked the car and said I know what's been going on," the woman recalled.
"She told me you sexually assaulted her.
"He said, `I admit it went too far and it went over the line'," the mother said.
Johncock has pleaded guilty to one count of indecent assault but not guilty to rape, aggravated assault, four counts of indecent assault and two counts of aggravated sexual assault.
The incidents allegedly occurred between September 2001 and March 2002 and a sexual relationship continued for some time after.
The woman said her daughter finally told her about the alleged abuse towards the end of 2003 while they were watching a show about paedophiles.
"I said if it's the last thing I do before I die, I'm going to find out what happened to you at that school," she said.
"She (the daughter) burst into tears and said she had been sexually assaulted by Mr Johncock."
The woman rang Johncock at school and left him a message.
"I just wanted him to know I knew," she told the court.
In January 2004, the woman arranged to meet Johncock at a Launceston car park where several sexual encounters had occurred.
She drove her daughter's car to the meeting and told him he should resign.
"He was continually saying `I'm sorry, it should never have happened'," the woman told the court.
Johncock provided the woman with a letter of resignation on the last day of term two that year.
The letter read: "I am writing to you to inform you of my intention to resign. I have not acted in a professional manner at all times and take full responsibility for the events that took place between myself and a student.
"It's best for all concerned that I take this action - B. Johncock."
The woman denied questions from defence lawyer Simon Brown that she had pressured her daughter into making the allegations to police.
The student's friends also gave evidence yesterday as did St Patrick's College deputy principal Donna McWilliam and the school counsellor.
The three friends told the court that they learned about the alleged incidents at a birthday party in March 2002.
"She told me he had gone up to her house, put his hands in her pants ... and forced himself upon her," one friend said.
"I remember being upset. I thought school was a safety zone and you're in the care of the teachers."
The trio rang Johncock at his home late that night and called him a paedophile and told him to stay away from their friend. The next day one of the complainant's friends visited her at home.
"I said `I know what's been going on between you and Mr Johncock'," she said.
"She started crying and said `I wanted to tell you but I thought you'd tell the police or my mum'."
One of the group then told Mrs McWilliam about the alleged sexual abuse.
A meeting was held on March 14, when both Johncock and the girl separately denied any sexual relationship.
Mrs McWilliam said the girl became flustered and said she was friends with Johncock and saw him a lot but there was nothing inappropriate.
The trial continues today at 10am.