1)Tell her in a nice way that you cannot see the relationship going beyond friendship. It is
  better to be honest, otherwise she might think you are leading her on and might start to
  fantasize.

2)Send her an "accidental" email. If her name is Anmol, address her as Anjali or something
  Create a fake story. For example, "Anjali, it was nice to chat with you the other night.
  I hope when i am in Nepal, we can go to Nagarkot as planned."

3)Send her a goodbye email which goes something like, "The past year has been wonderful. You are
  a nice person and it was a pleasure meeting you. However, i do not see any possibility of a
  relationship between us. I wish you best of luck and happiness for your future."

4)Send her an "accidental" text message on her mobile.

5)Change your facebook status to "In a relationship." And appear busy on facebook.

6)Tell her you are not really into Nepali girls. You like korean or filipino girls.