Shamima Begum - the east London schoolgirl who travelled to Syria to join so-called Islamic State - will begin her appeal against the removal of her British citizenship next week.
Ms Begum, now 19, left the UK in 2015 and was recently found in a Syrian refugee camp after living under IS rule for more than three years.
Former Home Secretary Sajid Javid revoked the teenager's citizenship in February, prompting her family to take legal action against the Home Office in a bid to overturn the decision.
The Special Immigration Appeals Commission, a specialist court which hears challenges to decisions to remove someone's British citizenship on national security grounds, is now due to hold a four-day preliminary hearing in London beginning on Tuesday.
Individuals appealing to SIAC usually remain anonymous, however it is understood that Ms Begum has waived her right to anonymity.
Ms Begum, then aged 15, was one of three schoolgirls - along with Kadiza Sultana and Amira Abase - from Bethnal Green Academy who left their homes and families in February 2015 to join a fourth Bethnal Green schoolgirl, Sharmeena Begum, who had left London in 2014, in Syria.
In February, Ms Begum was found nine months pregnant, at a refugee camp.
Ms Begum said she was married 10 days after arriving in Raqqa to a Dutchman who had converted to Islam, Yago Riedijk, who she claimed was later arrested, charged with spying and tortured.
She eventually left Raqqa in January 2017 with her husband but her children, a girl aged a year and nine months old and a three-month-old boy, both died. Her third child, a son, also died shortly after he was born.