She isn't home, any more than a British paedophile who goes to Thailand to live because he likes young boys is 'home' if he is caught by the authorities over there.
She is a British citizen, who was born and raised in Britain. She has Bangladeshi background. She has nothing to do with the country fo Syria, where she is currently residing, regardless of whether she went to some imaginary idealistic caliphate, formed by a terrorist group that was always going to be ultimately defeated.
She's a Bangladeshi Brit with no link to Syria, the Levant or the Arab world as a whole.