Girl won't make eye contact, what does this mean?

I was dancing with a girl the other night, and I had (and still don't have) any idea as to whether or not she likes me. Until that moment, we hadn't talked very much, and I was surprised she was willing to dance with me. After some nice conversation - getting to know each other a little bit, we stopped talking and kept dancing, but she kept looking away and avoiding eye contact. (In general, our interaction was positive, and had gone well) Was she nervous? Or did I screw up? What does this mean?

Girl won't make eye contact, what does this mean?
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