I’m thinking maybe a lousy childhood (but she has both loving parents and has a loving brother). Maybe a team of yes men all around her and probably starting to believe it? Maybe was clinically born with it? Also could be slight disabilities (coming out with Tourettes Syndrome) causing the depression, or maybe sold her soul to the music industry and now living with regret (not getting David Icke or anything conspiracy). Who knows the other words? Maybe attempt a meet and greet at one of her shows and ask her yourself.