Sabella's mother died in may and her sister died in november. she is at risk for

She is at risk for bereavement overload

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.

That is true , instead try to have a sit down talk with them