You may well be able to do it by using Apple's Target Disk Mode, booting up your Mac as in the link info which would allow hers to see your optical drive.
I honestly don't remember if Target Disk Mode sees your optical drive as it is normally used for hard drives, but I believe it does. If so your optical will just appear on her desktop as if it were installed in her machine. Worth a shot if you don't have an external optical drive laying around.