Conscience and Conscious. It's not surprising why people sometimes mistake one word for the other, unknowingly.
It's probably an honest mistake that TS doesn't even realise. If I were her, I'd be wondering why you're harping on this.
"Conscience pricks". Just because someone knows the word "prick" (ie. needle pricks, not the noun), doesn't mean that they can't make mistakes too. Quite snobbish, y'know?