Girls, how should I have responded or act? (Repost)?

Repost - I am not able to post query in my previous question - I started conversation with her, few days of greetings then after few days she started to ignore me completely. Then After 3 days of ignoring she was weirdly looking at me and making eye contact when I arrived in common area the same evening she did the same. It appeared to me she wanted me to talk, but the way she was looking at me made me super uncomfortable and scared me literally. Now again ignoring me.

Girls, how should I have responded or act? (Repost)?
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