Thanks for your question. I will try to help.
The easiest thing to do to get her to the UK to settle with you is to marry outside the UK first, she can then apply easily to come to the UK and settle with you.
If you are an EEA member state national then she will have to obtain an EEA family permit first and then travel here to settle with you
She will have to apply for and obtain an EEA family permit in order to secure her right to travel and stay in the UK to work. She will need to apply for it before she can travel and must submit the appropriate documentation to the UK embassy closest to her:-
Once she has come to the UK on her family permit she will be eligible to apply to the home office for a residence card which confirms her right of residence in the UK on the basis of your marriage:-
It will either take the form of an endorsement in her passport or as a separate immigration status documents confirming her right to reside here for 5 years.
At the end of this time she will be able to apply for a Permanent Residence here if she wishes and has not spent significant time outside the UK. This is the right to stay in the UK permanently without any visas and regardless of whether she remains married to you.
If you proposed to marry in the UK, then it’s a bit tricky if you have not been in a relationship (ie. cohobating with her) for two years because there is no EEA right to bring a fiancé here to marry. She would have to apply for a marriage visit visa (https://www.gov.uk/marriage-visa/overview) and then return to her home country and then apply for a family permit in the same way as above.
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If you have cohabited for that length of time then you would normally be able to apply for a family permit without being married on the basis that you are in a durable relationship. This would mean that you would not need to marry in order for her to come her on a family permit.
However, the issue is that you have to prove that you lived together. If you don't have tenancy agreements, utility bills, banks statements and other records showing that you lived at the same property for over two years then it's going to be difficult. You could attempt to apply without these things but with statutory declarations/affidavits swearing that you lived together but it would be likely that they would reject it for lack of evidence and you would waste further time.
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