When Kelly started singing Beautiful Disaster, I think that’s when we all knew this was special. Not just another Greatest Hits show. Everyone was crying. Somehow she outdid her Breakaway album performance… ~20 years later.
A speech pathologists (and Kelly fan) view on Kelly Clarkson canceling. Vocal injury is real. It can occur over time OR one single instance can cause several different injuries to the vocal folds. This could explain the last minute cancellation. It sucks, but she is human.