Education and intelligence are two different things. Intelligence is not necessarily dependent on education. Manipulation of another generally requires intelligence, so a smart woman, regardless of completed grade level, may have no problem having her way with people. This is especially true for the husband since she likely knows intimately what makes him tick...what his fears are.
The husband must draw a line in the sand since this isn't healthy for the relationship. There must be give and take on both sides, and generally loving couples do not terrify and manipulate one another.