Jay Leno’s sister from another mother.
Essentially, low ability people, like Cross, do not possess the skills needed to recognize their own incompetence. The combination of poor self-awareness and low cognitive ability leads them to overestimate their own capabilities.
The term lends a scientific name and explanation to a problem that many people immediately recognize—that fools are blind to their own foolishness. As Charles Darwin wrote in his book The Descent of Man, "Ignorance more frequently begets confidence than does knowledge."
Her overvalued ego enables her to semi function in the real world.
'Ego is the anesthesia that deadens the pain of stupidity.'