[Ah, well. That sure is... interesting. She'll address the matter of who the idol herself is in a moment, but first, to address what was actually said...]

Well, I imagine we have to play by this world's rules for the time being... And I'm sure you'll learn with time. I'm actually rather inexperienced myself, all things considered. [She pauses, clearly mulling over the next part before she says it.] I'm sorry, but... did you say 'Persona'...?

[Because, yeah, that's what mainly caught her attention there.]