#1
watch?v=SPXOp2bPhQQ

which notes does she play in 0:57 and 1:56 - 57 ? that pitch or something..
#2
There's a couple notes in there... And some chords.

I'm assuming you're talking about the artificial harmonics.

https://www.youtube.com/watch?v=-GXl0ebC6QU

There's actually a difference between artificial and pinch harmonics. The causation behind them is essentially the same, but artificial harmonics are the technique used in the video. Pinch harmonics involve sort of pinching the string 5, 7, or 12 (typically) frets above a note. I'd link a video, but I can't find one at the moment.
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#4
The 0:57 one looks like an artificial harmonic on the 4th fret of G string (I figured it out by looking at her hands in the video). But the fret you play with your right hand doesn't matter that much. You just want the harmonic to sound really high pitched - the pitch could be whatever, it doesn't really matter that much. But the closer your bridge you pick, the higher pitched the artificial harmonics sound. Add some vibrato and it sounds awesome. I would try lower frets (2-7) because artificial harmonics are easier to do on lower frets.

The harmonics at 1:56 are natural harmonics played on the 5th fret of D, G and B strings.
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