Shy girl doesn't say much more than hi and how are you?

I have a crush on a female coworker of mine. We're both abit shy but we regularly greet eachother, usually saying hey with a smile, maybe asking how are you.

Problem is, aside from her showing interested by a warm greeting, she's doesn't seem that interested in further conversation when we've got the chance to, and she generally sits on her phone and avoids eye contact, but she'll still say hello/bye and ask about me when i ask about her.

Why is this? is it just because she's shy? is she interested or not?

Shy girl doesn't say much more than hi and how are you?
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