It sounds like you hang out in a "red light" district boi! Lol! Get a LIFE man!
Julmi, you mentioned that the gal is a gori. We goris do not distinguish between sexes, we have grown up in an integrated society and most often have friends (JUST friends) of both genders. She hangs out with the married dude because they apparently get along. Its common, and it does not mean that they are interested in each other "in that way" if you get my drift.
As far as her watching you and saying hi etc, it sounds like she is interested in at least attempting to start a friendship. Dont get all in a twist over it, just gather your thoughts and if you want to persue a friendship with her, have a list of things in your mind to talk about. Things like "so how do you like working here", or "My commute to work is too (long/short), how is your commute" ...which would lead to where do you live, do you like it there, have you always lived there. Or - keep it more work related as in "the thing I'm working on is going really (great/bad) because of (whatever)....what are you working on and hows it going.
The thing is - try to just FORGET that she's a gal. Talk to her as you would talk to ANY co-worker. Then things will just move along nicely.
Good luck!
couldn't have offered more sound and practical advice...
it's very easy for desi guys to get led on by simple social gestures that they mistake for "interest", so Julmi, don't assume anything just yet, but no harm in testing the waters gradually as suggested to see if she is indeed interested.