No eye contact, no interest or just shy?

Hi everyone, there is this girl from college that I saw in a group. When outside my class, I notice someone quite similar to her. Although I am not 100% sure that is her because of masks. Nevertheless, the eyes and the hair were quite similar. I was waiting in the hall when she passes and tried to identify if it was her or not. The problem was she avoid eye contact. The first time she passes she went for the bathroom and the second time when she was leaving I could saw her spotted me that's when I saw her eyes. The big question is was she just shy because didn't know me or just not interest?
No eye contact, no interest or just shy?
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