The revelation from the Bangladeshi foreign ministry that Shamima Begum has no claim on citizenship and will not be allowed in should illustrate to the home secretary the danger of making decisions in a hurry.
"She is a British citizen by birth and never applied for dual nationality with Bangladesh", Foreign Affairs Minister Shahriar Alam said in a statement, adding: "There is no question of her being allowed to enter into Bangladesh".
News reported that the Home Office has sent a letter to Begum's mother, received Tuesday, notifying the family of the decision which it said the teen had the right to appeal. It's a bit upsetting and frustrating. "If he gets sent back to prison in Holland I can just wait for him while he is in prison".
She said an "option" could be to apply for citizenship in The Netherlands, where her husband and the father of her newborn child - an IS fighter believed to be held by Kurdish forces in Syria - is from and has relatives.
For example, I have that right to Irish citizenship, my brother has taken it up. "I feel like it's a bit unjust on me and my son".
Begum was 15 when she and two other students at the Bethnal Green Academy in East London traveled to Syria to join ISIS.
The Home Secretary said he wouldn't take a decision that would leave an individual with nowhere to go.
Interior Minister Sajid Javid told MPs on Wednesday that revoking citizenship was "a powerful tool" not used lightly.
Mr Javid said the power to deprive a person of citizenship was only used "in extreme circumstances", for example, "when someone turns their back on the fundamental values and supports terror".
However he hinted that Begum's newborn son could be treated differently.More news: Big discounts and offers for Asus smartphones — Flipkart Mobile Bonanza
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Begum gave birth to her third child at the weekend, and appealed to British authorities to show "compassion" by allowing her to raise the baby in Britain - while expressing no regret over having joined IS.
In response, the Begum family's lawyer said that they would be fighting the order.
Begum is believed to be a dual British-Bangladeshi citizen, although her family's attorney has said she has never held a Bangladeshi passport and is not a dual citizen.
Ms Begum was born in Britain, has never had a Bangladeshi passport and is not a dual citizen, Mr Akunjee said.
A Home Office spokesman said Javid's priority was the "safety and security" of the country. This, however, expires at the age of 21 if someone with entitlement to Bangladeshi nationality has not made an active effort to obtain their Bangladeshi citizenship. That is a far more sensible approach, albeit perhaps not as politically attractive.
"Bangladesh asserts that Ms Shamima Begum is not a Bangladeshi citizen", he said.
Begum is now in a refugee camp in northeast Syria where she fled to escape fighting in the east of the country along with hundreds of other people with links to ISIS.
Guidance on British citizenship on gov.uk says "A child born outside the United Kingdom will be a British citizen by descent if either parent is a British citizen otherwise than by descent at the time of the birth".
However, this power can only be used where the person concerned has dual nationality, as leaving an individual stateless is a breach of global law. She's British and there's an end to it. Government is something we Brits do to ourselves, not something we do to create outcasts.
The US-backed Syrian Democratic Forces (SDF), which is just days away from capturing the last sliver of territory controlled by ISIL, say they have captured more than 800 European fighters, and have another 2,200 women and children in their custody.