Why would a girl look at another girl and keep staring at her?

Gothamny21
So, for the past few months there was this girl who rode the same city buses as me once or sometimes twice a week, and she would always stare at me. A couple times with a little smile/smirk but for the most part it was an intense and long stare, even when I caught her staring (which was most of the time) she would continue to look. And when we both got off the bus to take another one, her eyes would follow me. A couple times I was with a friend waiting at the stop and she would stand near us, seemed like she was eavesdropping or something, while sneaking glances at me. My friend noticed it as well. Another time, I had my hoodie on looking down at me phone and I looked up and turned my head to the right and I caught her staring... again!

I'm not weird looking or anything. I have been told I'm pretty. It's just made me a bit self-conscious.
Why would a girl look at another girl and keep staring at her?
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