Help im so confused with this girl?

Ok I work with this girl at a restaurant and shes 2 years younger than me (im 19). It was wierd how we first met when one of our supervisor introduce me to her and he said we should hook up cause were both single. both of our reactions was "huh" at the same time. but we were cool to each other and became friends. But sometimes When im cooking I catch her looking at me everytime and I get nervous. When I come to work she always says hi to me in a high pitch voice like she was glad to see me. whenever I was in the back prepping, she comes by and talks to me about anything or just to even say hi. Everytime she ask me if I was going break, and if I said I cannot she makes this pout face. She asked me if I wanted to go to a concert with her and some friends but I didnt knew the band so I said no. She quit smoking and kept asking me to quit with her. I finally quit with her after the thrid asking. my co-workers always tease me that shes my gf. I dunno if she has a thing 4 me. I realy likeher