Is this girl not interested in me?

So I sometimes go this place for work. I saw a girl quite hot working there and couple weeks later she approached start chatting to me asking what I'm doing etc. We had casual conversation for quite long time she was verh pleasant and smiley etc.

Next week she was busy but still said hi. Last 2 weeks I been like 2 weeks ago she seemed not even recognise me. And this week she not even look at me at all. After initial approach she seemed into me but can't be? Of course I'm kinda shy so avoid approaching her To.

Maybe if i approach her she be friendly again. But I'm always hesitant and wait for some signal even a smile and hello. Plus I'm not a chatty guy so making conversation is not easy so I don't do often.

Is this girl not interested in me?
Post Opinion