Is she really interested or just passing time? Why is she not calling?

I was cold called by a girl who claims to have a crush on me and asked me if I want to be in relationship.
Said she saw me in the college fest. I had called back a day later to verify the legitimacy by indirectly asking details. Her roommate picked up because she was too shy to talk. Seemed legit since they could answer my questions.

But we have not talked since that day. Was that just an experimentation on me... lol, whats going on. Why isn't she calling back? Don't kill me in curiosity. All I know is a name and a voice.
Is she really interested or just passing time? Why is she not calling?
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