David is in a double bind. He wants her to go into long-term residential care because he is is not coping. On the other hand, he is terrified that if she does she will starve. At the moment a tray of food is placed in front of her every meal time and, if no one helps her to eat (and they usually do not), it is taken away untouched an hour later.
Can I just reiterate, as I have done a number of times before, that there is absolutely no fucking excuse for this. Take the nurses and auxiliaries outside and flog them, and then let us turn to a salutory story: that of Tantalus.
Tantalus' punishment, now proverbial for temptation without satisfaction, was to stand in a pool of water beneath a fruit tree with low branches. Whenever he reached for the fruit, the branches raised his intended meal from his grasp. Whenever he bent down to get a drink, the water receded before he could get any.
So then lock the nurses and auxes in a room, with their hands tied behind their backs: every couple of hours put food just out of reach and do that for a week, whilst feeding in a constant drone of delicious recipes.
And if they haven't learnt by then, take them out back—by the bins—and shoot them in the back of the head. These people are not worth the poo that their patients shit.