What is the main conflict in Lullaby by Leslie Marmon Silko?

"Lullaby" is one of the most noted pieces in Storyteller. It is told from the perspective of an old woman reminiscing about some of the most tragic events of her life, all of which seem to be precipitated by the intrusions of white authority figures into her home. She recalls being informed of the death of her son in war, the loss of her children taken by white doctors, and the exploitative treatment of her husband by the white rancher who employs him. Furthermore, these events seem to have led to a long-term alienation between the old woman and her husband. Yet she also recalls strong ties with her own grandmother and mother.