London (CNN) British teenager Shamima Begum, who left the UK to join ISIS in 2015 and has expressed a wish to return home, is to be stripped of her UK citizenship, her family's lawyer said Tuesday.

The 19-year-old, who gave birth on Sunday, made headlines last week after she was found in a refugee camp in northern Syria by UK newspaper The Times and said she wanted to return to Britain.

Lawyer Mohammed Akunjee said in a statement on Twitter that her family were "very disappointed with the Home Office's intention to have an order made depriving Shamima of her citizenship."

He added that they were "considering all legal avenues to challenge this decision."

ITV News reported that Begum's mother had received a letter from the Home Office which said an order to remove her citizenship had been made. The letter asked Begum's family to make her aware of the decision and of her right to appeal.

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