Why did she turn her head to look at me while I walked by?

When I walked by her in the halls, the second I was within visual range, she completely turned her head in my direction as I walked past her for what felt like hours. I thought it was a coincidence at first, but when I walked past her a second time later on in the day, I caught her staring at me again. She didn’t look away after eye contact though, which I found strange. I’ve noticed she’s usually shy only around me, a bit anxious at times. But I find it weird for a shy girl to not look away when caught. And she also has no trouble talking to other guys or anyone in general, she’s pretty outgoing. So what’s up?

Why did she turn her head to look at me while I walked by?
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