Thanks for more inputs guys....
But please dont argue ... esp sukla and khalisisi bros..
sukla bro bahaduri kasaile janmidai bokera aayeko hunna ra tyo padarsani ma ni rahera dekhaune kuro pani hoina... 
khalisisi bro kag le kan lagyo vandaima kag ko pachadi nadaudinus...
Hope you guys understand my point.

But today I got some Ideas..  I was really worried how to get her here. And I cant apply for fiance visa(thats only for citizens). But I never thought Student visa can be a good option.. 
But option of marrying is still open. Most probably I will go Nepal anytime between Aug to Oct. If I marry her in Oct can anybody suggest how long will it take her to be here in US (in terms of number of months) ? If it will take more than 6/7 month this might not help me as well because I want it ASAP. The more I wait wait = more pressure on her.

Once again thanks to each and every input...