Eastern European girls, especially Russians, are notorious for being cold until you break down some of their barriers.
She's grown up around guys that are prone to getting drunk of vodka and being aggressively direct with their game. Like, calling her over and over if she doesn't pick up. If she gives even a little encouragement, they become even more aggressive.
Do a little research on picking up russian girls, and the difference their cultural upbringing makes in your approach.
Here's a thread on another forum discussing Russian girls and their initial coldness
http://www.pua-zone.com/showthread.php? ... -%28off%29
Also a paraphrased quote of my last girlfriend, a Ukrainian girl, talking about when she first came to my country. "I didn't speak to anybody except other Ukrainians, I didn't even try to learn English because I thought it was below me. People would try to talk to me in class and I would just ignore them." I asked her if people thought she was a cold bitch and she said "yea probably"