Shamima Begum, who left the UK to join ISIS at 15, lost her Court of Appeal challenge against the removal of her British citizenship.
Begum traveled to Syria in 2015 with school friends to join ISIS, where she married an ISIS fighter and lived in Raqqa.
Then-Home Secretary Sajid Javid revoked her UK citizenship in 2019, while she was in a Syrian refugee camp.
Begum challenged the decision, arguing it rendered her stateless and was unlawful.
The Court of Appeal ruled against Begum, stating it wasn't their place to agree or disagree with the decision.
There's potential for further appeal, with Begum's lawyers citing statelessness as a key issue.
Begum has made public appeals, claiming she's not a bad person and was a victim of child trafficking.