Girl is telling me she is in a relationship?

I told girl that I liked her. we had common job together. Her answer: "You make me feel awkward to proceed working with you. In addition to this, I am already in a relationship with someone else. If it happens again, I will not continue to work with you". After that she wants very much to work with me. What does it mean? Maybe she is testing me?
Girl is telling me she is in a relationship?
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