Its about how the war ruined families
D: Jo is independent
Since it says that Jo is strong, wild, and happy all alone. I can only conclude that Beth is calling Jo Independent.
The writers of Harlem Renaissance attempted to spread the word about beauty and richness of the work done by African Americans. In the 1920s, this took place, and America started recognizing the work done by African Americans. This movement laid the foundation of the Civil Rights movement.
The idiom is butterflies in her stomach