I mean they're constantly on her shoulders, but they are actually companions (if you zoom in on some of the shots the moths sometimes are just flying near her). So, everyone see's butterfly attack lady. If, instead, she didn't have the moth companions, she could have at least tried to come off as a wizard powerful enough to levitate themselves while trying to crush you and your friends.
Also, did anyone else go with the concept of Maghda was dropping the hints of where the sword was specifically so you could do the retrieving of the pieces for her? I know that's what I figured she was doing, but it could also be read as her being an idiot in giving away where things are located at in the world.