I can pretty easily imagine myself as a musician and performing would be my least favorite by a landslide. Her discomfort with it so evident.

Yes her voice is really the reason why she got any fame at all IMO. I did fail to mention her talent as a lyricist! The words were perhaps a bit simple but she knew her vocal emotionality would add all the necessary subtext. And in general I think she had a natural skill for saying a whole lot with few words in her songs.