User blog comment:Woest/The Light and Darkness of the Guild/@comment-7418318-20140316091038/@comment-7418318-20140316171859

That's a nice theory.

We know that the Nine Demon Gates are immortal and can be resurrected even after their bodies were completely destroyed.

If she wasn't Human, it would explain why her ghostly body is different from Roubaul's who was Human.

And it would also mean that Fairy Tail might be able to revive her in those tanks that Tartaros used to bring their own members back.