The Danish girl, whose name was not revealed, will receive her final sentence on Thursday, but under Danish law, attempting a "terror act" can lead to life imprisonment.
She was arrested last year in her home in a village located 65 kilometres west of Copenhagen, aged 15 at the time, after her family alerted the police about suspicious chemical experiments in the basement.
The court in the town of Holbaek said in a statement that investigators found "a bottle of hydrogen peroxide, a bottle of citric acid, a bottle of acetone and a plastic tray with unknown liquid residues inside a metal bowl". The chemicals were purchased at a Danish cosmetic chain store.
The girl, a Muslim convert, had written notes about planning to carry out attacks in both her former primary school in Farevejle and in a Jewish school in Copenhagen.
She also wrote about her sympathies to the Islamic State group (IS) in her notes and tried to contact its leaders via Twitter.
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