She's preganant, she ruptured a tendon and she had life threatening complications from her first birth.
" some point, either when she had the tendon surgery, or else, she guesses, during her pregnancy, Smith developed several large pulmonary emboli—blood clots in the lungs.
“Halfway through [my pregnancy] I started feeling bad,†said Smith, who rehabbed her foot during her four months of pregnancy and then started running again at five months. “I ran every day until three days before I gave birth, but I was really tired—I would run and then I would have to sit on the couch all day. I just thought it was harder to breathe because I was pregnant. Looking back, I had a lot of the signs that I was developing these clots in my lungs.â€
Takes guts to have a kid knowing things could go south.
She could come back, after the next 12 months, if nothing bad happens after this pregnancy. Saying that she's retired takes all the pressure off.