Why did she change her mind and give me her number?

I have a crush on a fellow coworker and I mustered up the courage to ask for her number on her last day. At first she said no and I was fine with her decision. Then, maybe an hour later she calls me over and says she thought about what I said and gave me her number. Now I'm confused on if she's interested in me or I'm just thinking into it too much.

Why did she change her mind and give me her number?
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