Interesting, and quite possibly true. I also think it's quite possible that she is "in too deep," as the saying goes. Pride may push her to feel that if she quits then that means skeptics win and she loses, and also that perhaps if she quits then that's basically telling the whole world that she always knew she was a fraud and she can't stomach that thought.
Besides, she built the family empire. What would her quitting at such a crucial time do to them? Would they have to admit to being frauds, too?
I know what I'm trying to say; I just hope I made myself understood here!