kenkamishiro:

I don’t know if anyone’s mentioned this on here (X), but the chapter 63 title, “葬生樹“ (Tree of Burial), can be pronounced as souseiki, which has the same pronunciation as the Book of Genesis (創世記).

So not only is Eto giving herself up as a “sacrifice” to destroy the “twisted birdcage”, she is helping to create a new world, where ghouls can exist freely.