Magical thinking is the attribution of causal relationships between actions and events which cannot be justified by reason and observation.
Jehovah's Witnesses aren't the only people to engage in magical thinking, but they do seem to have perfected it into an art form. It must be the cult mind control that causes them to think things must be true because they need them to be. Your mom gets her books early, which helps her, therefore Jehovah must have planned it that way. There is zero evidence that God was involved, but she looks for things that confirm her faith, while discounting things that would tend contradict her beliefs. She needs there to be a God, so she she's evidence where there is none.
I see this kind of thing everywhere, like when people's say that everything happens for a reason. What would be the reason for the holocaust then? Good things happen, bad things happen, there is no plan, nobody is at the controls, no one is ever going to be, however hard that is to accept.