How can I tell if a girl is avoiding me?

spencers94
I was at a dance on Saturday (high school) and this girl that I met at school over a month ago at another dance was continually asking me if I was going to go to the dance that night. I told her yes and that I would be there soon since it already started and was only 20 minutes into it. Then she texted me and told me to text her back once I got there. So, I did and told her that there was a line out the door and that I'd be inside in about 5-10 minutes. Once I was in, I texted her, asking her where she was, because it was inside our gym and there were a lot of people in groups. Finally, I found her and asked her if she wanted to dance. She said, "Um...maybe in a little bit." After that, I felt kind of awkward, as if she didn't want to be around, even though she was ecstatic about seeing me at the dance. NOTE: When I met her, at the dance over a month ago, we danced then, so I felt comfortable to ask her to dance this time, and believe it or not, she asked me to dance initially at the previous dance. Anyways, I let her chat with her friends and gave her plenty of time until she was ready to dance, and I walked around the gym to meet up with my other friends. Then about 20 minutes after that, she texted me, telling me to come and dance with her. We danced to 2 songs, (grinding, because everybody else was and that's what most high schools do) and then she stopped dancing with me after that. So I assumed that she just wanted to take a break, so I, again, walked around to hangout with my other friends. I walked back to her about 20 minutes after that and asked her if she wanted to dance some more. Her friends were giving me some awkward looks and she looked up at me and smiled in me in a kind of annoyed or grossed out manner and said, "Oh, no thank you!" I walked away and never went back to her after that and just hung around with my friends for the remainder of the dance. What could this possibly mean because she was excited to see me and dance with me and then she just rejected me. I wasn't being pushy with her, I gave her space and let her say what she had to say and didn't interject. So, what is the deal here?
How can I tell if a girl is avoiding me?
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