"at the time of her disappearance four years ago Sir Bernard Hogan-Howe, then Commissioner of the Metropolitan Police, said if the girls came back they would be treated as 'victims' who were groomed online and would not be prosecuted.
Around 800 men, women and children from Britain went to Syria and Iraq to join ISIS - but 400 returned and only around 40 have been prosecuted for terrorism offences.
The majority have been put in the dock using Section 5 of the Terrorism Act 2000, which relates to 'preparation of terrorist acts' and can be applied to jihadi brides if they can prove they were 'assisting others' in preparing or carrying out acts of terror.
Those convicted using this law have been jailed for up to seven years - but the law is being changed to increase this to ten years in prison.
Sir Peter Fahy, former head of Greater Manchester Police, said he could understand why Britain is "not particularly interested" in bringing her back.
He said: 'If the woman was showing complete remorse, it would be completely different'.
Former Met Chief Superintenden Dal Babu said she and her friends were 'victim of brainwashing'.
Labour MP Harriet Harman said: 'I agree. 4 years ago she was only 14. Groomed online (I presume) lured abroad to be used for sex, became pregnant, lost babies. CPS will consider prosecution if she’s committed crimes. But UK is her home'."