How can my girlfriend get a visa?

I’m a dual citizen (Turkish, American) I recently moved to Florida for business so me and my girlfriend got separated. I want her to come spend a few months here with me and I’ll be going to Turkey a few times a year to see her. She has a passport but no visa. What is the best way to get her a tourist visa? ( Not a fiancé visa!)
How can my girlfriend get a visa?
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