I've been thinking about this. Bad parenting shouldn't be against the law. That's the point we're getting to, and the state is making decisions that only parents can make with clear conscience.
There might be some lives lost if the state doesn't intervene. But I'd wager more are saved if the parents who know their children best do the decision making.
It has been the case ever since I can remember that parents are not allowed to refuse medical treatment for their child. I remember court cases like this coming up in the 1960s and 1970s. The parents lose these cases.
In this specific case, we really do not know what is going on. The girl could be a victim of Munchausen by proxy, in which case her parents are convincing her that she has a real disease, and the medical doctors have found otherwise. Parents engaged in Munchausen by proxy can kill their children, all the while displaying a high level of concern and affection for their child. I shouldn’t actually say “parents”, since usually it is the mother imposing Munchausen by proxy, and the father, thinking that she is displaying love for the children, never suspects the dark truth. In extreme Munchausen by proxy, mothers hurt or poison their own children. Munchausen is a mental illness.