Honestly? I'm not really sure. I don't think she is, because she would've disappeared when we beat her. Right? That's usually what happens.

[ And there wasn't a Shard either. No Labyrinth... ]

But basically everything we know for sure about the Imaginaerium is just what she told us. So maybe Mirages don't always come from Shards?

[ She gives a frustrated little yowl and scrubs at her hair. ]

Aaaah, thinking about this is gonna give me a headache...