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Thanks for your question, it's obviously a very difficult situation.
If she is deported then she can only come back to the UK after getting married and then applying to the British Embassy for a spouses visa to allow her to come back to the UK for a period of two years before she is required to make a further application.
Whether she would be granted a spouses visa will be at the discretion of the Home Office and the reasons for deportation will count very heavily against her. It is probably that the HO will refuse her application initially and she will be forced to appeal. Without knowing the full details of the case and her reasons for deportation it is impossible to say whether she is likely to be sucessful but, suffice it to say, she us up against it from the start because of her deportation; even if she left early the reasons for the deportation will subsist and remain noted by the HO.
It will probably take at least two months (and probably quite a bit more) from the date of her application before a final decision is made on her visa, and she will actually have to get married first.
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