I really appreciate Sophia's character, and my impression of Sophia's psychology is multi-layered. She is a high-level achiever within the realms of a structured environment with established rules and unquestioned authority. She is very aware of her achievement status, although is only mildly condescending. She lives and thrives within the structure of the structure, and has never really ventured too far out of it. She excels conspicuously in academics in most any subject because the rules are the same for each class. Assignments are given, read the material, research when required, do the work and get the 'A'. In sports the coach defines the skills required, she does the drills, works hard during practice, adjusts her sleep and nutrition, studies the rulebook and excels. In music the maestro teaches music theory and technique, she practices the lessons and takes critique seriously by the maestro after the performance. In short, she pays attention and is fastidiously disciplined to the point that it becomes her identity in all aspects of her life.
She is a rule follower, and has very little tolerance for others that do not follow the rules. We see this early on when the movers are not punctual, or drop her 'mommy's stuff' box. This fastidious nature is seen at the dentist's office; she has perfect teeth. It is seen in her figure; no muffin-top here. It is seen in her hygiene; she takes a bath before taking a shower. It is seen in how she follows the rules of marriage. Did she get pregnant before marriage? Yes, she did, because within the social rules that are widely accepted pre-marital sex is not frowned upon. Did she quickly get married once she discovered she was pregnant? Yes, because it was part of the expected rules she grew up with. Is she loyal in action and thought to Liam as long as the structure of the rule-set holds? Conspicuously so.
I see this story as a break-down of the structure around her, and her inability to quickly adjust to it because she depends on that structure and never had to really adjust to portions collapsing before