Ok so I read post after post about and experiencing the fall to your death after grabbing the dawnbreaker sword and talking to her. I kept dying and dying anyways. I hadn't read about the shout to become ethereal. So I unlocked it, saved the game before grabbing it, grabbed it, and talked to her. And of course you cannot shout while in mid air, so i kept mashing the shout button with the ethereal shout. A low and behold, right at the right moment in time the shout activated and I became ethereal and didn't die. This is the only time that I saw it work. I lived to talk about it. Try it out.