English speaking tourists are a dime a dozen in many parts of Ukraine.
If you don’t bother to learn a few basic phrases, she’s going to lump you in with all of the horny and drunk Turkish tourists who are known (You can get a free trial of Rocket Russian, which is excellent, by clicking here.) This isn’t the United States with it’s last call at am, with closing time being am.
…at least learn a little bit so you can greet her in Russian.
This will at least “lower the guard” a bit, so to speak.
In modern dating, there seems to be three “usual” acceptable ways of meeting people.