@R13521k,
Update:
Thanks for all the suggestions and encouragement here.
So early this week I approached her again, and casually asked her for a coffee on Tuesday and again for a lunch yesterday, to which she agreed, both the times. We spoke about random things, but nothing personal. There were some awkward silences as well. Now, I adore her even more, but it is still hard for me to guage if she has any interest in me at all. I think she is very nice person and just being friendly. (Both the lunch and the coffee were very very casual. The lunch was at my company cafeteria, so I don't think it means anything.).
This morning, I found out that this weekend I have to go out of the country on a business trip, for a whole month!! I guess I will wait until I comeback to move forward and ask her out. One month of restlessness..