I think you need to tell her how you feel. As to waking her up the Socratic method works best....things like " I've heard a lot of worrying things about child abuse ( show arc site) if there are so many peadophile elders, can they really be appointed by holy spirit? What do you think? "Then let her work it out for herself. Gently coach her critical thinking skills,they will be rusty..encourage don't berate with argumentative attitude or just spout facts. If she "discovers" ttatt herself it will become " her own" and not a source of resentment toward you.
Its good you want to protect your kids from cult indoctrination. However, who knows..if you'd forced the issue previously you may have driven her back to their arms and confirmed their prejudices. You did what you thought best at the time it as you've matured you've realized the danger the cult poses to your kids.
Do get marriage guidance councilling..