Why has a random girl and I just started talking in person?

She and I don't know each other but we've just seem to have naturally clicked. It's just come out of thin air that one day she started imitating some form of contact with me. Now it's progressed to us comfortably having a conversation. One day she was giving me her undivided attention in talking to me instead of working.
Why has a random girl and I just started talking in person?
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