At this stage of the game if you tell her how you really feel about the Organization, she'll be even more convinced of Satan's craftiness and wickedness in trying to entice others away from the "trooth" and will most likely turn on you also. I'd try to get information from her about why this friend wants to leave and slowly focus her attention on these reasons. Not everyone is inclined to believe and fall in line just because the old geezers say it's so.
who knows, it may spark a little critical and independent thinking on her part.