Understanding Plot Structure in Character Development

In a literary narrative, the structure often plays a pivotal role in how the plot unfolds and impacts the reader's understanding. Consider the following excerpt from a fictional work where the protagonist experiences a series of events leading to a major revelation:

As the sun dipped below the horizon, Clara sat on the porch, recalling the events of the past week. She had never anticipated that the discovery of an old letter would unlock secrets about her family's history. Each revelation was like a puzzle piece falling into place, shifting her perception of those she thought she knew.

How does the plot structure primarily influence Clara's character development throughout this excerpt?