No harm in her visiting for a few days a tourist, but be VERY careful before filing a K1 visa for marriage. If she comes to the US and you get married, even if she leaves you or scams you are FINANCIALLY responsible for providing housing for her and paying any debt she incurs for 10 years. Even if you don’t know about it or approve it, it is legally your responsibility. It’s become very common for women from Eastern Europe to marry a guy on the Internet, come here on a K1 visa, and then leave that guy for someone “sexier” and simply create debt for guy #1. She literally could leave you the day after the marriage, and she’s already a legal resident. You would have to go through the long and expensive process of filing for an annulment and waiting for the courts to take their sweet time— while being responsible for her. You also have to meet certain income and job requirements in order to qualify for a K1 visa. Have you made sure you meet those? I would just be very wary about her intentions before moving forward with her. There are so many horror stories out there.