She is not Czech and it is quite obvious from what we hear here (what she sings is quite far from our language - in fact, we articulate like German in front, not like Americans with everything inside ;)) But she does here very well overal, I like her Milada personally much more than her Rusalka
Those honest composers didn't get too much with the singers. My parents singers have always said that the Italian opera is singing itself. But to pronounce Czech and to sing is a horrible work.