I really don't understand why her opinion matters.  Anyone listening to her speak quickly realizes the intellectual limitations.  

That being said,  a concerted effort by the corporate owned media/statists/plutocrats to paint Brexit with unflattering doom & gloom at every turn, is indisputable.   Since Palin is considered by many as "divisive",  using her dovetails with that ongoing  effort. Propaganda 101 - Negative Association.  

I'm no Palin fan, however, she's correct in the assessment. What was once a trade association among countries quickly evolved into an every expanding centralized bureaucratic power (Brussels) attempting to control most every aspect of daily life.  The U.K. simply reasserted her sovereignty.