Why she suddenly ignoring me? I have a friend girl at work , we were so okay in past 5 months. then she Suddenly ignoring me , avoids eye contact?

She even shares her food, tickles me everyday, and etc.. but now she will talk to all the people in a room, and pretends that i'm not even there or even exist. I Don't remember if i've done something wrong. So, right now im doing exactly the same thing to her.
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Okay, update. We still not talking, avoiding each other, but now i often see her looking at me. Ugh this mind game that she starts is really pushing me to my limits </3
Why she suddenly ignoring me? I have a friend girl at work , we were so okay in past 5 months. then she Suddenly ignoring me , avoids eye contact?
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