If she was going to abort, again, she wouldn't do it in the third trimester. Also, she wouldn't kill the born child, she would give it up for adoption instead if she didn't want them.
Learn to use some logic, man.
But, to answer your ridiculous scenario, by definition of the law and not morals, two murders would have been committed. I cannot give you a moral answer because all logic prevents such a scenario from occurring.
Also, it's called a thread, retard, not a string.