So that mirror Miyako in conjunction with Shijin’s description of “The mere shadow of what was once Miyako” probably means our heroine is a wolf monster that possessed a girl named Miyako and took over her body?
Kidding aside, what if the character shown in the mirror was the real miyako in the evilest form (cause she resents being taken over by the wolf) and that the wolf monster just wanted to be a human?