WHEN a 16-year-old girl assaulted her mother with a knife, she was sent to juvenile detention.

She was just eight the first time she threatened her mother with a knife. She had also similarly threatened her foster carer, attacked a teacher and stabbed a fellow student. She appeared to have a fascination with knives, the Supreme Court heard yesterday.

Now 25, the woman is suing the state for allowing her access to the knife she used to kill a teacher, Scott Bremmer, in a cooking class at the Yasmar detention centre.

The court heard she was allegedly sexually abused as a child, had been assessed as retarded and suffering from intermittent explosive disorder. Since she was sent to Yasmar at 16, she has assaulted her solicitor, doctor, psychiatrist and two teachers, one of whom was attacked with a leather working tool in July 1999. Two days later, she was allowed to participate in the cooking class, despite staff allegedly raising concerns that she appeared "hyped up". Her handcuffs were removed and she was given cooking implements, including knives.

During a break, she allegedly showed "heightened interest in knives", and after returning to class, she fatally stabbed Mr Bremmer. She was charged, and eventually sentenced to a limiting term of 10 years under the Mental Health Act. She has been held in isolation for most of that time, has assaulted guards and tried to harm herself in custody.