Why did she giggle?

Im kinda starting to like a female coworker of mine. I've only had a couple small interactions so far though. Today i had another one, i was putting some stock away, i didn't know where something went, so i asked her, she kinda smiled at first without saying anything before another coworker told me where it went. She then started to giggle/laugh abit as i walked away.

I've heard giggling can be a good sign but why do you think she mightve giggled? She is Asian if that makes a difference?

Why did she giggle?
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