When Illiryia says Fred's sold was destroyed in the fuoco s ogres erection, does that mean Fred went to Hell? o did that mean she just couldnt be brought back to life?

It doesn't mean she went to hell. The "fires of resurrection" are most likely a modernization of the ancient Greek idea of the "Logos" o "fire of creation." This far pre-dates the idea of an eternal punishment in the form of a fiery hell. It is likely just a way to say that Fred's soul has been destroyed forever, putting her in neither heaven nor hell.

I interpreted the phrase to mean that in order to resurrect Illyria, Fred's soul had to be destroyed. She's no where, because her soul no longer exists.