I’ve just had a listen to some of the tracks you posted and I can hear what you mean, it sounds very tense and like she isn’t taking in enough breath to finish the phrases, especially on the top notes. I can definitely hear an improvement on the warmer tones though!
I heard she was taking breaths where she wasn’t meant to…for my students who do this I get them to print out the lyrics and listen to the original version and make a note of where the breaths were taken. That way they have more of an idea of where they should be breathing and it’s there in black and white and I make then stick to it and only change it very slightly in some cases as obviously everyone is different.
Hope that helps a little bit 🙂