I think she's been there all along. I'm not the only one she gave the power of Persona to.

[ She's Izanami after all, she must be older than the oldies. ]

I see... The Velvet Room? So you know Igor and Margaret then. [ For a moment he starts to make a comment about Igor's nose but decides to drop it. ] I'm sorry to say that I've never met him.

And yes, I do see butterflies that look odd around once in a while. They never did anything though. Why?