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ANSWER: If you want her to come first, and then get married, you have to do the fiance visa process.
You first file the I-129F petition for her in the US. Then it gets approved and goes to the National Visa Center. Once processed there, it goes to the US consulate abroad. She files a visa application with supporting documents, goes through a medical examination and an interview, and if approved, she is issued a fiance visa.
She uses that visa to come to the US and must get married within 90 days of entering with that visa. Then she can apply for adjustment of status to permanent resident and gets her green card.
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