I've known of various people who, like your mother, swear up and down the JWs have the truth and that they are true believers in what is being taught, yet they do not go to meetings or in field service. They won't hear a negative word about Watchtower Corp. But they do not do what is required of the dubbies in terms of meetings, service, etc.
How can you believe it with ever fibre of your being yet at the same time not get baptised, go to all meetings, and out in service? I don't get it!