Sawyer said her exclusive interview with Dugard, 31, showed the woman's incredible strength and determination during her horrific 18-year captivity
by Phillip and Nancy Garrido
. "She astonishes me on 1,000 levels. And I do not say this often, but facing a birth, and then another, in a backyard, without hospital care, without really knowing at all what's going to be involved. Having nothing but the videos that you watched to try to get you through. It just says to me that she's made of some enormous strength -- no matter her age -- she has enormous strength and enormous will to live," Sawyer said.