Even the jury's were amazed too but they were not convince as they thought that she was just lip syncing and stopped her at a later part of the song. The jury's have decided to let her sing the song in 'A Capella'.
A cappella is technically defined as singing without instrumental accompaniment, some groups use their voices to emulate instruments; others are more traditional and focus on harmonizing. --source:wikipediaWhen she started singing again in 'A capella', everyone were blown away as she still sounded exactly the same as singing with instrumental background's and music.
At that time the jury's were convinced and she was able to make and won the competition.
Watch and listen to her amazing voice in the video.