G-d Bless Her
Gabby Giffords is the new Chuck Norris. Except she's real, of course.
As anyone who has witnessed someone facing death and disease will tell you, luck about the "bullet just missing" such-and-such vital organ tissue is just one element of survival. People will themselves to live for a wedding or a new grandkid all the time. Quite literally, Mrs. Giffords is alive because she decided to be.