The schoolgirl was 15 when she and two students from Bethnal Green Academy, Amira Abase and Kadiza Sultana, escaped to Syria through Turkey in February 2015.
In an interview with the Times, Shamima Begum (19), who was nine months pregnant, talked about the awful sights she witnessed adding that they "did not faze her", however, wanted to come home for her baby, the BBC reported.
The British government has said it won't help them out of northern Syria but if they manage to get to a place where there is a recognised government then they'll see what they can do.
Speaking to the Telegraph, Hussen Abase, father of Amira Abase, said his daughter made a mistake when she fled to Syria.
Sultana was reported to have died in a 2016 air raid on Raqqa.
He said there was no consular assistance in Syria and insisted he would not attempt to rescue Ms Begum.
Begum spoke fondly of her time under ISIL, saying she lived a relatively normal life despite seeing "beheaded heads" in bins and being forced to observe ISIL's strict and literalist interpretation of Islam.
Security Minister Ben Wallace said the heavily pregnant 19-year-old could face prosecution if she returns to the UK.
She did not regret going to Syria, she told the newspaper, and expressed support for the murder of journalists, whom she said had been "a security threat for the caliphate".
"I don't have high hopes".
Counter-terrorism officials say fears of a flood of battle-hardened Britons who travelled to Isis territory returning to the United Kingdom have not materialised, but they are finding it more hard than they hoped to get evidence of wrongdoing.
She said she'd had two other children who had both died.
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"I was also frightened that the child I am about to give birth to would die like my other children if I stayed on so I fled the caliphate". "That's why I really want to get back to Britain because I know it will be taken care of - health-wise, at least".
Begum's sister, Reenu, urged the British government to bring her home.
She could also ultimately benefit from a government program created to de-radicalize former extremists and help them integrate into society.
ISIL still retains a presence in Syria's vast Badia desert and has claimed a series of deadly attacks by sleeper cells in SDF-held areas.
"There was so much oppression and corruption that I don't think they [ISIS] deserved victory", she said.
Begum said that the three girls were put in a "house for women" when they first arrived.
"It was from a captured fighter seized on a battlefield, an enemy of Islam".
As a result she said she was "really overprotective" of her unborn child.
He said he thought it was unlikely she would be allowed to return quickly and expected that, if tried for any offences, she would be tried as an adult, he told BBC Radio 5 Live's Emma Barnett.
Tasnime Akunjee, a lawyer who was instructed by the Bethnal Green girls' families after they ran away, said he was "glad (Ms Begum) is alive and safe".
She told The Times: "The caliphate is over".
Dal Babu, a former Metropolitan Police Chief Superintendent, said it should be remembered that Ms Begum was groomed as a child to become a radicalised woman and was a "victim of brainwashing".
With the Islamic State's territory dwindling to nothing, more and more members, including females, are surrendering to anti-ISIS forces.