The contestant came up to sing at the Ukraine's Got Talent, she sings so well, so closed to the original that the judges thought she is lip syncing or her song have been recorded and replay.
So, she sings again without the melody and that is when she prove herself she is singing with her original voice. So many comment on the youtube. Since I do not understand the Ukrainian, to understand, I needed to read what people are talking about the contestant.
One comment by Digital Art goes, "True and not only lip syncing, but to make sure she wasn't auto tuned or over processed into the music feed. Wish I understood Ukrainian, or w/e lang that is. Actually interested in what they all were saying."
Another user said, "Probably more along the lines to her voice being ghosted by a vocal on the backing track, just subtle enough to not be obvious, but that could give more body and richness to her voice."
Finally, she proved herself she sang with her own original voice.