The 19-year-old, known only as 'Aicha,' appeared in court in Maastricht on Friday after returning to the Netherlands on Wednesday with her mother. She made a brief court appearance behind closed doors to decide if she should remain in detention, with another hearing scheduled for Monday to decide if she should be charged. A convert to Islam, Aicha had been arrested "on suspicion of crimes threatening state security".
Marc Bax, a spokesman for the court, said: "Today the examining judge has reviewed the custody order of Aicha and concluded that it was lawful." Aicha's mother, Monique, is said to have rescued her from the Syrian city of Raqqa, after the teenager travelled there to marry a fighter.
Aicha reportedly fled the Netherlands in February to marry Omar Yilmaz, a Dutch-Turkish fighter who trains fighters for various groups fighting against Syrian president Bashar al-Assad.
Yilmaz, a former soldier in the Dutch army who also did national service in Turkey, is one of a group of Dutch nationals fighting in Syria. Monique said her daughter, previously known as Sterlina before adopting an Arab name, said she saw Yilmaz as a "Robin Hood" figure.
An estimated 130 Dutch nationals have left to fight in Syria, with 30 already having returned and 14 others killed in the fighting, according to the latest statistics from the Dutch intelligence services. Edwin Bakker, Director of the Centre for Terrorism and Counter-terrorism at Leiden University in the Hauge, told Al Jazeera that the authorities were primarily interested in hearing the girl's story.
"She is formerly a suspect of allegedly having joined ISIL, that has to be proven," he said. "I think authorities are primarily interested in hearing her story, who helped her get to Syria and how. "It used to be very rare until a year ago, but more and more this year girls have joined fighters in Syria. Many of them are very young."