True enough but why not just say Constance? My guess (or hope) is because this ghost bride isn't Constance. Although to your point, yes I'm well aware that spectral means "spirit" but it could also imply she's illuminated in some way. Regardless, I'm still hopeful it isn't ConstanceTM.
I'm hoping that someday the beating heart bride will return. I'd take an animatronic over a poorly done projection any day.