This is really sad. Scary too on a number of levels. Personally and globally. But I'm torn. I think.
At one level, I have some small sympathy for the parents. It must be hard to see your child, help her, know her as your own, but otherwise be unable to engage with her at a meaningful level save for smiles and such. There may be an element of the protective there. Certainly a read of the anonymous entry by her parents would suggest as much.