Answer:
vertical social mobility.
Explanation:
Vertical social mobility is a situation when a person move either up or down within a social hierarchy.
In most societies, vertical social mobility is heavily influenced by 2 factors: ownership of Resources and influence. Having more of either of these factors will make a person move up within the social hierarchy, and vice versa.
In the example above, Siting move from the daughter of a shoe shiners into a Neurosurgeon. Her job as a neurosurgeon most likely provided with more salary and influence compared to her shoe shiners parents. This means that she experience an upward move within the social hierarchy.