As a long time running fan I would say that it is remarkable what she has done post-surgery from cancer in 2010. People don't realize that they removed part of her hamstring and outer connective tissue in her leg. If you look at a photo of her running you can see a literal long indention in her leg. She was never supposed to run again past jogging according to the medical experts.
She has had one of the most under-rated careers in US female distance running history. Four times under 2:30 in different marathons and 10th and 11th place finishes in the World Championships among many other great performances.