A bomb disposal expert investigates an unattended package in Copenhagen, Denmark on February 17, 2015. PHOTO: REUTERS
A police press release said the girl's 24-year-old friend, who local media have said was a former fighter in Syria, had also been charged with complicity in preparing the bombs.
Danish broadcaster TV2 said the girl had recently converted to Islam.
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She was arrested on January 13 and her friend the following day, accused of, among other things, having provided the girl with manuals for bombs. Both have pleaded not guilty.
They have not been named by the authorities or media, according to Danish practice.
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The Danish intelligence service said the arrests had not changed their assessment of the security threat, classified as "serious" since February 2015 when a gunman killed two people in shooting attacks on a debating event and a Copenhagen synagogue before being shot dead himself by police.
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