There is no way of managing the risk - forced contraception is not allowed (quite rightly IMO, because the bad outcomes from going down that road would far outweigh the good).
So she will get pregnant again, and she will conceal the pregnancy again (which is not illegal), and she will give birth in secret again.
Now they may or may not actually have made a viable long term plan next time around, but I suspect it's more likely that pigs will take to the skies. So, one way or another, that baby too will fall victim to the chaos. It may live - or live a little longer but sure as ova are ova it will either die or (with luck) be removed into care.
I once arranged a funeral for a woman who had had 13 children taken into care. Nothing stops people like CM except menopause.