She lowers her voice and binds she goes out of her way to BE AS MANLIKE AS POSSIBLE she just looks extremely androgynous.

... As an aside she's likely going to be rather mute when she comes back and not talking much so I doubt Guy will even hear her voice too often. :V Even if he does it's just "decidedly androgynous" basically. Not as deep as her OU!Self, but not very girly either.