Girls, What does it mean when a girl seems genuinely happy to see me?

ando90
I didn't get any responses so I want to repost this question.

I said hello to this girl at my work, who i get along very well with. She seems to be very happy that i said hello to her. She fully turned her body to face me and started a conversation with me. The way she looked at me was different to other girls who i talk to at work.

She even intiated conversation with me the other day by yelling out to me in a very happy tone saying " you having fun there". I was just doing a pretty boring job that was right in her sight. I replied with a response in a joking manner and she giggled.
Girls, What does it mean when a girl seems genuinely happy to see me?
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