Final answer:
Sophia most likely has Obsessive-Compulsive Personality Disorder (OCPD) as her preoccupation with schedules, perfectionism, and distress over lack of control reflect the criteria outlined by the DSM for this personality disorder.
Step-by-step explanation:
Based on the psychological assessment and the behaviors described, Sophia most likely has Obsessive-Compulsive Personality Disorder (OCPD). This diagnosis aligns with her preoccupation with orderliness, perfectionism, and control, which manifest in her constant need for schedules, lists, and managing trivial details. Not to be confused with Obsessive-Compulsive Disorder (OCD), OCPD does not necessarily involve the presence of obsessions or compulsions but focuses more on an enduring pattern of behavior regarding organization and perfectionism.
Individuals with OCPD tend to plan excessively and strive for perfection, often at the expense of flexibility and efficiency. They may become upset when control is lost or when others do not conform to their rigid standards. According to the American Psychological Association's Diagnostic and Statistical Manual of Mental Disorders (DSM), Sophia's traits of adhering strictly to rituals, such as planning to the last detail and significant distress when plans are disrupted, are indicative of OCPD. Her behaviors are long-standing, inflexible, and pervasive across various contexts, which are key characteristics for a personality disorder diagnosis.