She didn't lie to them. She deceived them. They never even asked if she cast the spell upon herself.

And she still brought them harmony.

This ep would've been so much better if the moral was you can't pretend everything's okay when you keep getting explosively angry at the littlest things. Alas, instead the moral was "You can't maintain a dictatorship without lying to everyone and getting defeated when they find out, also you randomly get super angry b/c you're the designated villain."