Hello again, this is Jennifer and I will be helping you today. Please remember that the other question I helped you with has no rating yet. This is the only way that I receive credit.
To apply for the fiance visa it takes about 5-8 months after you submit the application now. The application you will need is the I-129F. You can find it on uscis.gov/forms . You do no have to be engaged in order to submit the fiance visa for her.
However, she cannot change from the visa she is on to a fiance visa inside the US. The fiance visa is used to enter the US. So no she cannot wait here in the US while it is processed. She will have to depart and once it is approved, she can reenter the US with the fiance visa. She will only get 3 months inside the US and you have to marry within those 3 months.
Good luck to you during this process and I hope this answer has helped you!
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