Final answer:
The behavior described is best defined as authoritarianism, a parenting style characterized by high demand for conformity and obedience along with limited warmth.
Step-by-step explanation:
The psychological term that best describes Mimi's mother's behavior of being overly controlling is authoritarianism. An authoritarian parenting style places a high value on conformity and obedience, with parents that are often strict, tightly monitor their children, and express little warmth. Diana Baumrind's research identified this as one of the four parenting styles, which also includes authoritative, permissive, and uninvolved. While effective parenting styles can vary by culture, the authoritarian style is generally seen as resulting in children who are anxious, withdrawn, and less happy, although in some cultural contexts it can be as beneficial as an authoritative approach.