B2 to F2 change

[stalvl]

I am an F1 student and wonder how Can change my gf's B2 status to F2...Do we have to be officially married? Or I can just say she is my fiancee?

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[Santiago]

I am an F1 student and wonder how Can change my gf's B2 status to F2...Do we have to be officially married? Or I can just say she is my fiancee?

No, you have to prove your marriage.
As far as I know, fiancee status cant be used for a F2 visa.
You might want to contact an immigration lawyer for more confirmation.