Girls, why is this girl so quiet around me but is very social with everyone else?

So I started this job a few weeks ago and saw a girl around me who I thought was really pretty. I caught a glimpse of her peeking at me a few times, so at first, I didn't think much of it, but then it happened more consistently over time. Every time I see her around, she's always social and bubbly around people, but when she gets near me, she gives me the silent treatment. I tried to talk to her, say hi, or just ask her simple questions here and there, but it's like she doesn't talk. I'm not very good at this; I am very introverted and find myself overthinking things and simply making whatever makes sense work. There have been times when she'll be near me, but she won't say anything. There will even be times when she kinda leaves when I get near to interact with people I talk to on a daily basis. I'm feeling a bit lost and unsure about what to do because I want to approach her, but I don't want to come off as weird or awkward. I really respect her and want to make sure I approach her in a way that shows that. Apology in advance for the grammar.

Girls, why is this girl so quiet around me but is very social with everyone else?
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