A daughter, killed by her mother, was diagnosed with behavioral issues months before her murder.
On Tuesday, a clinical psychologist testified in the second-degree murder trial for Aset Magomadova.
Magomadova has admitted to strangling her daughter in February, 2007. Her lawyer is arguing it's a case of self defence.
Harnisha Nathoo testified she diagnosed Aminat Magomadova with disruptive behavioural disorder.
Nathoo said the 14-year-old had "difficulties with peer relations and discord with teachers."
On Tuesday, court heard on several occasions the teen resorted to violence and threatened fellow students with a knife.
Nathoo said "[Aminat] was trying to explain about schooling in Chechnya. It was not unusual to go to school there and threaten a student or bring a weapon. She didn't understand why she couldn't do it here"
"I think it's part of the narrative part of the background for the judge to determine just who this young girl was and how that inter-related with the relationship with her mother," says Mark Tyndale, the defence laywer.
The Crown says testimony about the teen's past behaviour at school is irrelevant. "It doesn't matter what occurred before. What is essential in this case in the court determining what occurred the morning that Aminat died," says Mac Vomber.
