Shamima Begum is set to begin her appeal over the removal of her UK citizenship.
Ms Begum fled her east London home for Syria as a 15-year-old schoolgirl with Kadiza Sultana and Amira Abase to join the so-called Islamic State (IS) group more than seven years ago.
She has denied any involvement in terror activities and is challenging a Government decision to remove her citizenship, while Ms Sultana was reportedly killed in a Russian air raid and Ms Abase is missing.
