Jayci lost her husband, daughter, and home in a widespread wildfire in california. to overcome this ordeal, has she turned to old friends and self- groups in the community for emotional comfort, information, companionship, advice, and financial assistance. this relationship is known as

I believe the answer is: Social support
 
Social support refers to the assistance that given by other people in social group in order to alleviate the pain/problem of their members.
This support is given with the genuine willingness of the people, not because of some sort of laws/regulation.

The social support could take form in things such as emotional support, connecting them with professionals that could help through networking, providing financial assistance, etc.

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.