The reflection in the triple mirror again was not hers, yet she knew exactly what it was. As Kraehe she had hated herself, the ugly human-formed crow ..... she had never really looked into the mirror. How ironic that this was the form she always saw gazing back in her darkest hours. The witch clad in simple black contrasted sharply to the rich ornate white she usually wore.
Maybe she should have the mirrors replaced again. Mirrors were strange things in the realm of stories, they were prone to grow a will of their own when given something interesting to reflect. These illusions would cease for a while once the mirror was renewed, until the new mirror started to become interested. Sometimes raven eyes would peek over Kraehe's head and now, black wings folded open from behind her back. Whatever appeared to her was always varied yet endlessly the same thing.
She took the crown off her head, the reflection reached up as well only to lift nothingness of her head. Only when Rue held the crown before her did it appear as a reflection in the mirror, Kraehe longingly looked down on it.
A sudden rustle sounded behind her. Startled, Rue looked over her shoulder. She gasped and dropped the crown onto the cabinet.
For a second she had been certain to have seen black feathers shimmer out of existence. The pounding of her heart increased. Quickly she looked ahead again. Kraehe's expression showed the very same fear as her own did.
And .... once again, scene from a fanfiction I wrote, this one of Princess Tutu : Arboreal Archives
I'm not sure whether she actually looks scared as she should look, I'm not quite sure how to do that.
The mirror idea is from Snow White, so while Rue likes to think of it as illusions, it's actually a truth in varying ways.