Why is my coworker avoiding me?

I've seen her around, but never really talked to her, as she works in a different department. But sometimes she'll work in the same area as me.

Today, I noticed that she seemed to need help with something. She looked at me, then left, so I thought maybe I was wrong. That is until she came back to ask someone else in our department (who also didn't really know her) for help instead.

So basically, she just went out of her way to not talk to me? If I had done something to upset her, I'd understand. But I don't even know her name, and we have had zero interactions together. Am I just intimidating or something? I can't think of any reason why she'd avoid me.
Why is my coworker avoiding me?
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