Her voice was pretty much auto tuned during that part. It is (to the extent of human knowledge) not possible for anyone to do that unassisted.
Excuse you, her voice was not autotuned. But it was assisted.
For the fast bit the singer, Inva Mula, sang each note isolated for the recording, then it was strung together. But she DID sing those notes.
we were just talking about this song yesterdaaaaaaaaaaaaaaaay!