Why does my classmate (F) ignored me after messaging her?

I have this one classmate, she a kind girl we used to talk through messenger app because we only have virtual classes. We talked for a few days then suddenly she ignored me, my messages are only delivered. I got inbox (ed) through messenger. I tried to apologize to her through chat but she does'nt seen the messages it always said delivered, so i stop messaging her. But i am thinking why she doesn't unfriend me on facebook while in the other way she was ignoring me. Now, we're on the face to face classes and we don't talk to each other. We're just minding ouw own business. So can someone answer my question base on the title. Thank you.

Why does my classmate (F) ignored me after messaging her?
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