A schoolgirl accused of attempting to murder her best friend has told a court how famous serial killers had influenced her plan to kill her mother and brother and to carry out a school shooting.
The teenager is accused of luring her friend to a quiet part of the Hampshire school grounds where she stabbed her with a kitchen knife, causing a minor wound to her chest on April 25.
Giving evidence to the trial at Winchester Crown Court, the defendant, who was 14 at the time of the attack, described how she had researched school shootings including the Columbine massacre and Anders Breivik's shooting spree and had gained some understanding of the motivation of the perpetrators.
She said: "I wasn't trying to justify what they had done, but looking at why they did it gave me more insight into their whole case."
The defendant said she had created in a private journal a "kill list" of pupils at her school with a plan for a school shooting but she said that it was "not a serious idea".
She said: "There was no particular person for the kill list, the names that were written down were very random, there was no-one I had a particular grudge against."
The defendant said that her plan involved starting at the English room at her school but she added that she later burnt the journal because she did not want people to find out she had written it down.
She said that she was then influenced by researching the serial killer Edmund Kemper to plan the murder of her mother and brother.
She said: "I was very much inspired by serial killers, one of them Edmund Kemper, I think he killed his mother.
"I do not know the motive behind it, they (mother and brother) were the closest in my life, I felt like if they were gone then nothing would be able to hurt me any more."
The defendant said that she had made cuts to her face on the night before the April attack to copy Heath Ledger's Joker from The Dark Knight movie to make her look insane.
She added: "I had this ludicrous idea if I did get arrested for whatever I did I would put in an insanity plea."
The schoolgirl said that she had planned the attack to make her numerous personal problems disappear and added that "it would make all of those smaller problems not relevant at all".
She added that she had carried out the plans to make her "stand out".
The trial has heard that the defendant became upset and started self-harming the previous summer after someone created false social media accounts in her name, leading to her receiving "rude and suggestive messages".
She told police that she had believed the victim had been responsible and she had targeted her because she "felt uneasy" about her. The victim has denied being involved.
The defendant, who is now aged 15, denies charges of attempted murder and wounding with intent. She has pleaded guilty to unlawful wounding and possession of a bladed article on school premises.
The trial continues.