But were those Evies her reincarnated self (or other people who reincarnated) dying over and over or the Evie from the routes of the game that didn’t have the awareness that this Evie has?
Yeah, that's been bugging me, too. At some point, Dorothee found out that the world has a narrative, and even talked about it in terms that Yvonne would only really comprehend as a transmigrator. Did she figure that out on her own? Did some past Yvonne tell her? ...Is it possible that she's ALSO a transmigrator?
IIRC, wasn't Dorothe, the one that "sealed"(or at least helped) the Villainesse system in Yvone ? This may be the reason she know that this Yvone is different , and it may also be that This actual Yvone do behave differently her own Yvone.