Final answer:
The difference between what Josie can do on her own and with help exemplifies cognitive development and the education concept of scaffolding, where support from a more knowledgeable individual helps the child advance.
Step-by-step explanation:
The difference between what 6-year-old Josie can do on her own and what she can do with her mother's help is indicative of cognitive development and scaffolding. This concept is a key component of Vygotsky's theory, where an adult or more competent peer helps a child to do something they would not be able to do by themselves, thus 'scaffolding' the child to higher levels of thinking or performing a task. As the child grows more proficient, the help can be gradually removed, and the child will be able to complete the task independently.
In terms of psychosocial development, the main task of the adolescent is to develop a sense of identity, a process which is somewhat beyond this question's scope focusing on a younger, 6-year-old child. Still it's worth noting that during adolescence, the cognitive and social skills acquired earlier are vital in forming one's identity.