I have no idea either. But I think your spouse should be in Nepal. It is a different process if your spouse is outisde USA. I guess you better consult with attorney. or follow the forum listed below:

http://www.visajourney.com/forums/forum/112-bringing-family-members-of-permanent-residents-to-america/

Just post your query in this forum.

I hope it helps. I have no clue about NVC. 

Good Luck on your journey!!!!