Girls, is it normal that she ignores me after I rejected her?

well this girl showed interest in me. we never talked to each other but she gave lots of signs and even stared at me for a long time. one day i was walking in my school corridor and she stared again, but i ignored the eye contact. since then she completely tries to ignore me. i thought she would just stop giving signs but she pretends as if im not even there. i wasn't really interested in her but isn't ignoring to an extreme level a bit weird? she still stares at me from a distance, but the usual ignorance is back when im near her.
Girls, is it normal that she ignores me after I rejected her?
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