Scientology is about brainwashing. If she were not a cult member, if she were an ordinary Christian or Jew, or even nonreligious, I wouldn't be surprised at her decision.
So only stay at home moms who are Scientologists, which, by the way, we don't even know Katie is at this point, are brainwashed, whereas all other "non-scientologist" stay at home moms are engaging in an act of free will? That sounds a little kooky, don't you think?