Sunset grimaces internally as another pony steps past Celestia to greet her. Celestia had made it seem as though the gala would be impressive, but it was just a procession of pointless ponies.
Sunset wriggles her little pony flank irritably iside her shimmering cyan dress and steals a look back at it, admiring the way the flaming red/yellow sun appeared to illuminate the diaphanous fabric.
Her eyes flick forward to the latest mediocrity to say something meaningless to her. Sunset coos phatically back and, to her intense disappointment, is rewarded by a reasurring smile from her mentor.
Celestia had seemed so imposing at first. So important. But she wasn't. She was just as vacuous and empty as everypony else. She would rather fritter her time away on pointless socialising than achieve anything. But Sunset didn't need her anymore. She had found another place. A place where she wouldn't just be Celestia's little cheerleader.