Yuriko and the key

Is she, as a cyberized individual, a part of the key? A sort of “game master” if you will, hiding in the key from the hoshibune.

• She seems to know everything. She knows the real state of the player, Stella, kukrushka, about Gnos. (Also if kukrushka is a soulless body and Stella is just a “marionette”, Yuriko being a snob makes sense if she were a body less “soul”)
• She can seemingly control our reality. She removes our protections, reveals our true state to Raqio, changes our stats as the bug. I’m pretty sure Gina has her memory erased after we’re told about the hoshibune(the shrine maidens), since Gina never comments on what we learned.
• She is the only character whose status is unknown after the game (unless we count kukrushka disappearing after reaching otome’s planet).