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She probably just has other stuff going on besides you. There's no problem yet except your feeling desparate. Chill out! The last thing you want to do in this situation is look desparate. Don't call back and be like "where were you?" "I thought you were going to call me." When you do call her back after a day or two just pretend nothing happened.
This.
You are probably overthinking things because you like her a lot. Also, next time you guys call don't talk for too long again, use the phone calls/texts to set up a date. The longer you talk on the phone the less you'll have to talk about in person.
Be calm, focus on your own stuff, and game other girls in the meantime!