Why did she ask for my number?

Last week, I met a girl on a night out. We got talking and we found out we had a lot in common and we shared a few laughs. I walked her home at the end of the night and we sat outside her flat, just talking for about 20 minutes.

But as we were talking, she turned to me and said with a smile, "So, are you gonna give me your number or what"? We exchanged numbers and spoke a little more and then she gave me a hug and said goodbye.

She's not text me or called me since and I haven't contacted her either. I'll admit that I'm a bit shy/scared to "make the first move". I don't know what to do or why she asked for my number if she had no intentions of contacting me anyway. :S
Why did she ask for my number?
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