What I find very strange about all this -
Nurses are women and are therefore more likely to suffer from a hysteria induced illness. Yet during both world wars and lots of conflicts there have been female nurses not very far from the front line, seeing horrific injuries, lots of death despite all of their hard work under awful conditions. They seemed to cope with all that without succumbing to hysterical type ailments.
Nurses deal with outbreaks of things all of the time. Infectious diseases are....well, infectious, so you frequently get at least localised sporadic outbreaks of contagious illness. Surely, if nurses (being women) were particularly prone to some kind of hysterical reaction when working with the contagious under stressful conditions then we should be having outbreaks of hysterical illness all the time. We don't seem to.
Also matrons, nurses and women, and I'm led to believe also utterly terrifying back in the day. They could out a nurse, patient or doctor in place with a withering glare. I wonder if there could have been some background politics at play aiming to remove such a powerful (& female) authority figure.