This is an aria that is usually sung by lyric sopranos. However, Grob-Prandl, a high dramatic soprano (the loudest female type), sings it beautifully. She is not manipulating words or sound to produce an expressive effect. The music really does flow out of her, and she lets the music speak. This is in great distinction with the way in which today’s singers are trained. A sound is taught, as in brighter or darker or both. Expression comes from manipulating the sound.
Listen to the accuracy of the pitches. This is amazing for a voice of her size.