What makes you think this?I just googled it and she had a miscarriage that was occurring during the marathon, but there's nothing to suggest the marathon caused her to lose her baby confusedUnless I'm mistaken and missing something and you do have proof of this, I think it's quite an awful thing to say.It might make pregnant women who take part in a safe sport like running and lose a child feel extremely guilty, when they didn't do anything to cause it to happen. And put pregnant women off taking exercise. It's horrible to suggest that her taking part in a marathon caused her to lose her child.
I have no idea what your issue is, Iirc she said after the fact that she felt running or training contributed to the miscarriage. Not being her gynaecologist I obviously have no proof that it did or didn't.
The story was from 9 years ago and I don't remember the full facts, hence using a question mark.
The point I was making, and it was very clear I was making no judgement whatsoever, is that she might have her own reasons for not feeling able to finish the race. Possibly pregnant again and worried, possibly upset as the last time she did it she was miscarrying.
At any rate normal exercise during pregnancy is completely unrelated to running a marathon so I don't know why you'd assume it would put women off running in general. 
You might want to be a bit more resilient if you're going to go getting offended and running off on google adventure over comments that in no way implied any judgement though.