I want to know gown it work
Invitation for what? Are you saying your girlfriend will apply for a visa, or, you want to sponsor her on a fiance visa? For a visitor visa your girlfriend does not need an invitation from you.
I have 33 years experience and practice immigration law only. My answer to your question is general in nature and not to be construed as legal advise or as establishing an attorney-client relationship. For additional discussion regarding your personal situation a scheduled consultation is required.
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