Why is an extrovert girl reacting this way?

Skolski

She is my coworker and an extrovert one. I didn't know her that well (since she is new) but we have interacted a little before mostly about work and also saying goodbye's when leaving.

Here's a few instances that make me curious about. As I was walking towards my desk, I saw her looking at me for quite awhile before I noticed it. The following day, she lower her head and stares at me with a little smile. (This happened twice). However, I'm a shy guy I guess I didn't really acknowledged her that well. Now, she avoids looking at me and kinda gave me the cold shoulder but treats everyone else as how she normally would happily chatting and laughing even with other male colleagues.

I didn't really have any feelings towards her before but somehow developed it since this happened.

Why is an extrovert girl reacting this way?
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