I see. Thanks for the explanation! I don’t have any knowledge about the raws, but what I was referring to was that the scans team that worked on Rinna Keibu wa Iki ga dekinai referred to her as “Phantom Thief Mirror” (Example: Chapter 4, Page 12). They just sounded similar enough for me to wonder if it was a coincidence or discrepancy or whatever.
now that i see it, feel like her being a minor is just a way for the author to show how smart and genius she is which i have no ideal why they pick that route