Wiki says Slovenian and Serbo-Croatian which for someone of her age and origin is entirely likely. That said, I don’t think this gives you Russian proficiency. You can make yourself understood with some waving of arms and shouting, no doubt, but if she spoke to Putin it was likely in German. Not that it matters, either way, of course.
It’s a shame that of all the incredibly stupid and all the incredibly evil things Trump has done, is doing, and will do the media is focusing on just about one thing he did which is neither evil nor stupid. I mean, you have to go looking for something like that… jeez.