Sorry to dig this thread up from a couple pages down, but I had a thought today:
Given how quickly the G3 Divine Shine ponies deteriorated, specifically, Secret Wish, the pink one, who seems to be turning orange and losing glitter within a couple years... And how notoriously horrible G4 quality control has been... I suspect the same thing may happen to these new translucent glittery/confetti'd Cadances even faster, so those who plan on buying her may want to keep her very far away from any sunlight as a precaution.
I've actually stuck a PP's Boutique Pinkie in direct sunlight for an extended period of time (sacrificing ponies to science
don't pelt me with fakies, please!) with no sign of ill effect, which leads me to believe that having pieces of things intermixed with the plastic as opposed to glued on top may be causing the unusually quick material breakdown problem.
So uh, yeah. Hide your Cadances.
Maybe even buy yourself a backup to keep MIP and preserve her pinkness.