Why did she ignore me?

There was a girl who worked as a receptionist at my Dr's office. I really hit it off with her well... she made me forget about my ex who I struggled to get over for a long time.

I decided to call her at work and ask if I could call her sometime. She was genuinely flattered... excitement in her voice saying "OMG thank you so much". She then whispered her number to me to call her later I called her the next day and got her voice mail saying she is out of town for the holiday. I left a message.... gave it a few days and she never called. I called back and left another message... a week later no reply.

What would cause her to give me her number and never call me back? Aside from the obvious "maybe she died" excuse.

Thanks