said by DKS:
Quite right. The responsibility of care in nursing (at least among those who are competent) is every bit as intense as that of a police officer or the military. It's not called a "sisterhood" for nothing. And given that this nurse was a part of a hospital who was serving the Royal Family, she would have to be not only clinically top notch, but epitomize all the values of dedication and commitment which come with nursing quality.
I am also in line with that reasoning. On the other hand I am very curious as to the interaction she had with with administration before she left the hospital.