I think this is a really awful story and I don't think it should have been publicised against the parent's wishes.
Surely some situations in life are just so awful that none of us can really predict how we would feel / what we would choose if they happened to us? To then have that compounded by this sort of medical error would be completely horrific.
I am pro-choice. I also think that if I had been in this position I might well have made the same choice - to spare my baby a short, horrible life filled with agony and pain. Effectively she chose to euthanise her baby the only way that she could - before he was born. Perhaps if she'd had the choice to birth him and then ensured that she could give him a humane, pain-free death, she would have chosen that instead. But "natural causes" are very rarely that, and even withholding treatment / surgeries would presumably have had significant legal implications.
I really don't think she should be judged for doing what she did, whatever her reasons.