Why does she seem so happy/giggling?

I've known this girl for about a year now, early on i developed a crush on her and still do. I haven't ask her out yet because were coworkers, but im leaving soon and plan to on my last day. I really like her and i think there's a decent chance she does too.

Anyway, it wasn't until a few months ago when she started to giggle a lot, i can only observe when im around her so im not sure if its the same around others. But recently she just seems very happy, also abit more visibly nervous. I know she's single, she's not dating anyone as far as i know. My best guess is she has a crush on me, maybe, maybe not.

Why do you think she might giggle a lot and seem so happy all of a sudden?
Why does she seem so happy/giggling?
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