There is this girl at work that I have known just over a year now. Before I actually met her we would see each other but never really notice each other. A few months after the first time I saw her, she came up to me and asked me my name. I don't know how I knew but I had already known her name at that point. After we officially met it would just be your average hey! Here and there.For the past 3 or 4 months now things seem to be different. Now, when we see each other we have small conversations. Keep in mind we have to keep it short as we both work in the same place but different departments. She always smiles when she sees me and always tries to give eye contact. The department she works in has her working with anywhere from 10-15 people and we tend to cross paths a lot at work. When she is with the group and I happen to be in the area I catch her looking at me with a smile and then she'll turn away and a few seconds later she'll turn and look at me again with a smile. This will happen 3 or 4 times before I leave the area. I take the bus to work, she usually drives so I never see her on public transit. The other day I was on the bus to go to work and I saw her get on the same bus. She didn't see me. I walked up to say hi. She seemed happy to see me. When I went to sit in the seat in front of her, she said "here" and moved her stuff off the seat next to her for me to sit. Everyday she comes up to me and asks me a question that she knows the answer to, a certain schedule. About a week ago, one of my co-workers was telling me a new nickname he came up with for me and she happened to be in the room at the same time and overheard it and said it was cute. What do you think does she like me or is she just being friendly?

Girls are complicated. They really are. I had a best female best friend for four years. Always friendly, called, joked about marriage and kids, hung out a lot, etc. One would think that there was something there but I figured it was just because we were best friends. When people said we should just date already, she acted disgusted in a friendly way. Like: "no way!". When I got into a relationship, she acted much differently. Harsh and sometimes she would get angry at me for the dumbest things. Eventually she came clean. Now we are no longer friends because she couldn't be "just friends" with me. So I suggest you make a move. Ask her on a date jokingly or in a very friendly way. "I'm bored. Let's go on a date somewhere." something along those lines.

I agree with ali18ninja in that you should make a move. While it is true that girls are complicated beings, you mentioned behavior that could mean that she is interested in you as a person because:
a- she sees a potential partner
b- she sees a potential friend
c- both a and b
d- she is just an all around nice person and you may not notice her general charm with others and just with you (possible too)
e- other.

I suggest you keep being your regular self, since that's the person she seems to be drawn to, and make subtle moves, that show your interest back. Perhaps invite her out on casual date. To me it seems like all scenarios are win win for you because at the very least you will satisfy your curiosity and fine tune your social skills :)