Kuna
First, a pro dater is a real live person who will encourage you to either visit her, or spend some bucks for you to take her on a small vacation outside her city/country. If you visit her, her only 'job' is to make you felel comfortable with her and spend some money on her. Depending on you, she could go easy at first and then hit you up later, maybe even after you have gotten home. By then you may have some feelings for her and she will capitalize on this. Or she could try and shake you down while you are with her because she may not see in you any possibility of 'returns on her time' after you leave. If you or she suggests meeting in a 'neutral' place, just beware she may not show up at all, or if she does show and because of this you are now more comfortable with her (you trust her), she will again try to get you to spend some bucks as I outlined above. At a best case, you treated her a fun vacation.
A woman I met in person, who was a pro-dater, was telling me how much she wanted me while at the same time was 'entertaining' another man in Amsterdam. When he found me through a internet posting, we compared notes and he confronted her. she replied that there was no trust in their relationship and he never heard from her again. He lost $4000 in 4 days.
Some of these women are VERY good at their trade. Further, since they are real persons, there will never be a problem in asking for passports, addresses, phone numbers and so forth. They ENCOURGE contact.
The best advice I can give you here is trust your gut instincts. If she is trying too hard to get to know you, I would tread lightly. If she can only go to expensive places, needs clothes to be with you so she can look pretty for you, needs money for a phone to call you or starts with some excuses like she might be gettin ill just before you leave, beware. It is a set up and she is going for the long haul.
As most members here will tell you, honest russian women will never ask for money. And if they want to be with you, a walk in the park will work just as well as the ballet. If you want to go to the ballet and have 2 tickets, then just ask your favorite choice to join you (because YOU want to go) and I am sure she will appreciate it.