Maybe by some magic they found gone wrong, or our mane girls using some other magic on them, or this is their punishment after being defeated trying to take out the girls.
The good news is, the mysterious Equestrian artifact the Dazzlings had found did allow them to keep tabs on their rivals without being noticed. The bad news, well…
Because it… suits her personality.
welcome to the internet, where its full of that kind of thing
you say “bad news” like they wouldn’t have this as a secret kink.