Mia Janin, 14, was found dead at her family home in Harrow on March 12 2021.
Schoolboys are alleged to have used a group chat to make fun of her, an inquest at Barnet Coroner’s Court was told.
Her dad, Mariano Janin, said he believes she was bullied online by other pupils at JFS.
Her Year 10 form tutor at the Jewish Free School (JFS) in Kenton, Alistair Davey, said: “I was unaware of any group chats relating to Mia.
“She was a quiet, thoughtful and considerate girl. When she spoke, people listened.”
The inquest heard that Mia’s mother, Marisa Janin, had contacted the school to say her daughter was feeling lonely and isolated.
In one communication with staff, Ms Janin – who has since died – said Mia was upset at being one of the few children “never to have been invited to the bat mitzvahs of the girls in her class”.
Statements given by friends of Mia to the Metropolitan Police following her death were read out to the inquest on Tuesday.
In the statements, her friends said Mia was bullied by other pupils at the school, and that their friendship group was nicknamed the “suicide squad” in the months leading up to her death.
They said one of Mia’s TikToks was shared to a Snapchat group chat run by male pupils at JFS, where they made fun of her.
One child said the boys used the group chat to share nude photos of girls.
The child added: “They took screenshots of girls’ faces on social media and made fun of them. They shared a video of Mia’s TikTok and made fun of her.”
But North London area coroner Tony Murphy said there was no evidence that any images or videos involving Mia had been shared in the group chat, except for a TikTok video she posted the night before she returned to school.
The inquest has previously heard that Rabbi Howard Cohen, former deputy headteacher at JFS, told the boys to close down the group after Mia’s death.
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