The girl did not show up at our 1st date?

I met this cute girl from Mongolia in a club in Prague. She is the one who noticed me and came to hit on me by grabbing my *** (no she is not a hooker, and she also paid for her drinks the whole night). We spent time together from midnight to 04:00 AM, and she seemed to appreciate spending time with me since she practically d me in this club. Then we left the club because her girlfriend had a boyfriend waiting for her at home (they are university students)... I took her phone number, called her the next day and we set to meet at 06:00 PM. Since she did not show up, I sent her an SMS at 06:20 PM and told her that I was waiting for her. She replied immediately with her girlfriend's cell-phone (she did not have any credit on her mobile) with a long message and said that she had come, but she had to leave because she had a problem. She also asked me to call her at 09:00 PM. When I called her, she said she wanted to meet me the next day and that she was going to send me an SMS. Since I felt pissed-off, as soon as we hung up, I wrote her "I can't do it tomorrow, sorry". This ugly experience happened 10 days ago and since then, I have not heard from her. Can you tell me how a person interested in me like hell can change in less than a day? Maybe, she felt that I showed too much interest in her, or maybe she found an other guy? Any comments/suggestions are welcome.