If an unborn is a human being, we shouldn't do that to him, either. Unwanted children shouldn't be allowed to come into the world. This may be a good argument for birth control, but not for abortion if a real human child is already in the world, albeit not visible to the casual observer. Women shouldn't have to continue a pregnancy that is a result of rape. The question was somewhat loaded.
All rapes are vicious, brutal, and criminal, and all emotional anguish is mental anguish.
She chose her words carefully. Disagree and everyone would know how callous the candidate was. Certainly, carrying a child under these conditions can be emotionally devastating. The point can be made more obvious with a follow-up question. The rapist is a human person.