The US offers B-1 (tourist) visas to people from pretty much any country so they can come here for vacation or to visit. However, the US approves very few of them from the former soviet states, and your odds decrease if it is a single woman. Though unlikely she could have a Visa, but if she's as...
I think it's a scam. In general the US doesn't grant visitor visas (B-2) to people from the former Soviet Union, especially women (because the US is afraid they will not go back). Generally, the only way they can get into the country legally is under a fiancee visa and those take a long time...