Jemima has Borderline Personality Disorder! Elizabeth Gaskell describes it very much according to this article. Jemima mostly exhibits splitting, where opinions of people go from primary idealization to secondary vilification, and how that makes the sufferer shoot themselves in the foot in relationships. Mrs. Gaskell provides a very nuanced approach detailing a complicated milieu of contributing variables, especially from Jemima’s family dynamic. Her remedy, not of a diagnosis, but of an individual’s cluster of behaviors, is for a(n) (initially?) trusted person to help lead the sufferer out of the hyper-negativity through positive redirection and interactions.
The story is picking up now after something of a midpoint doldrum. I have trouble when the main character is removed from a well-established scenario to another one with new characters.