Very interesting observation, Sanddollar. I registered her extreme reaction but never stopped to speculate over why she becomes so explosive over this. Obviously, no one wants their elderly parents drawn into something to cause them anxiety, but the fact is that both her parents handled LE's visits perfectly well--in fact much better than Cindy has handled LE's visits.
The only reason I can come up with seems foolish and bizarre, but here it is: Cindy instructed LE not to interview her parents until after she had time to speak with them because a surprise visit would jeopardize their health. But LE flagrantly disobeyed her instructions which infuriates her. And, what makes her even more angry is that LE's surprise visit didn't jeoparidze her parents health at all--which means she was proven wrong.
The above seems lame, I know, but if you believe "this is all really about Cindy, in Cindy's mind," then I guess the above is possible.