@rezaone,
Wait until you see her at the bus stop. A whole bunch of things could have happened when you called her that doesn't necessarily include her completely ignoring her call.
Perhaps her cell phone service is crappy and she never got your call. Perhaps her phone battery was dead and her phone was subsequently off. Perhaps her phone was merely off because of personal reasons or preferences for the phone on the weekend. Etc....
Perhaps she just simply didn't recognize the phone number and didn't answer it. Did you leave a voice mail reminding her of who you were?