When my Dad was in a hospice, we were taken to one side and told how the body shuts down and how draining it can be to have to interact with visitors. They also told us to imagine trying to sleep and someone sat on a chair watching you. So we kept a rota where one of us was with Dad most of the day/evening but sat away from his bed unless he was awake, and reading a book/watching a tablet.
I can imagine that if they're being advised, she's not listening to a word of it...... I've lost a child, and know the absolute heart pounding terror that encompasses every cell of your body but I just don't understand this behaviour. It's like a form of cruelty.