My co worker keeps on smiling and saying hi to me?

Anonymous
I've been working with her for over a year now and she's a real kind person and likes to smile a lot.
But just today she kept randomly waving her hand and saying hi to me while smiling. Of course I would do the same back but couldn't help but wonder why she would. I mean it's not like I don't see her for hours on end. I do my job and see her every few minutes lol. She also looks back at me and gave me quick little smiles. And must I include she says goodbye to me EVERYDAY.

So I guess what my question is, is she just being friendly/kind? Or do you think she has recently gain interest in me and wants to see my reaction while giving signs.
Girls if you were to do this to a guy you work with what would it mean?
My co worker keeps on smiling and saying hi to me?
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