I think it is definitely beneficial to teach everyone as much as possible. The ad hominem arguments can be left out, though, so as not to cause a defensive reaction. That way the information given is received on better terms, keeps things more professional, and prevents further unnecessary drama on boards. Ask her reasonings and perhaps help her learn why she should expect the price to rise and drop instead of being condescending. I know we all get extremely irritated at certain points with people, because we are human. However, intelligence should rule instead of emotion, especially in this game.