what reaction should I be expecting if she is not interested or intrested in me?
If she's shy then you won't see much and she may actually pretend to ignore you hoping you'll approach her... but if she's got some guts then she'll smile at you or say hi or be near you and open enough for you to approach her and say something. If she usually wears headphones she'll take them out maybe to make herself more approachable by you :)
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