In that case, I'd propose that if Annie is an adult she’s essentially unreachable. No matter how much effort you expend trying to coach her on basic rational skills she isn’t going to get it, because as a general rule adult humans simply don’t change their basic approach to life that radically. You’d have to replace her entire social milieu with a circle of rationalist associates to have any chance of getting through to her, and even then she’d probably just adopt the surface appearance of rationality as a sort of social-acceptance ritual.

So as a practical matter Barbara, Caroline and Donna are the people who might actually join, contribute to and benifit from a rationalist group, and the question becomes how to balance your appeal to all three instead of restricting yourself to Donnas.