Your Indian Fiancee needs permission from the US government to allow her to enter the USA. This is called a K1 Fiancee visa.
Fiance visa applications are held only briefly at NVC, just long enough for NVC just long enough for NVC to assign a Mumbai case number and forward your file via diplomatic pouch to India.
Once her petition has arrived in India, the responsible consulate will contact your fiancee advising when they have scheduled her interview.
There are five US consulate service locations in India, but only the Consulate in Mumbai is responsible for the processing of all Fiance visas. So even if your gal lives across the street from a consulate, she will still have to make the trip to Mumbai or New Delhi for processing.
Two weeks before her interview date she undergoes a medical exam at a consulate approved clinic.
Finally she attends the visa interview at the consulate in Mumbai to demonstrate she is of good moral character and the engagement is Bona fide.
A week later a DHL delivers her visa, and then she can join you in the USA.
By Fred Wahl
Your Personal Immigration Guide