Why does she act like nothing happened? What happened?

Anonymous
So this girl I work with had agreed to a date with me but later when I tried to set up a time she ignored my texts. I had asked her in person and she didn't hesitate and was smiling the whole time. She then made sure we got each others phone numbers.
I was let down obviously but whatever. I wasn't going to bombard her or bug her. I just figured if she changed her mind she'd get back to me. Anyway the first time I saw her after that she was really quiet and avoided eye contact. As the week as gone on though she has been more friendly in initiating conversation and even playfully teasing me.

I'm confused she knows I like her so why did she do this? Why is she acting like this now? Did she most likely get back with her ex or find another guy?
Why does she act like nothing happened? What happened?
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