Why is this girl so moody?

This female coworker of mine...

Some days she laughing, friendly to everyone, up beat...

But other days she is so cranky, gives attitude, doesn't talk or make eye contact and looks like she want to kill you. She was like staring at me like she wanted too.

I was overthinking because I had a crush on her, and thought I did something wrong but I realize I didn't do anything... She is just like this.

Most people just get a bit cranky once in a while... understandable...

But she is at extreme ends of the spectrum.
Why is this girl so moody?
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