Girl acting weird after gift?

I told my crush at work that I had a present for her after work. It was a mix CD and I created a sleeve out of paper and put a note inside of it. She txted me later on in the night and said she popped it in immediately and loved it. Then the next day at work she treats me like I don't exist and just plain strange. I don't get it. She was thankful for the CD and now she's all weird?
Girl acting weird after gift?
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