Why is she not returning my call?

She always answers immediately when I call or text and she calls and texts me on her own as well. She always acts excited when she sees or talks to me. When we see each other just to hang out she would text me later saying things like "we should definitely do this again." We went out on our first date, had a great time, texted some the next week, and then I text her to go out again sometime next week and she said she would. I call her later that week to set up a time and get voicemail. It's been three days.

I'm not going to try again because I shouldn't have to. I told her to call me when she got the message. So I don't need any advice about that. I just want to know why would she give me all of these signals she's interested and then drop me cold.
Why is she not returning my call?
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