You are in a scary situation. She may not truly believe everything about witness doctrine, but she is paralyzed by fear. As Carl Sagan has pointed out, once a person has been bamboozled long enough, they are no longer interested in the truth. It is too painful to acknowledge, even to oneself, that we've been bamboozled.
I hope you won't let her take your children to any JW religious activities. Being the man gives you some power in the JW world. Use it wisely, to protect your children from love bombing, indoctrination, baptism, disfellowshipping, being shunned, mental slavery, and all of the consequences thereof.
Is there anything she is interested in, such as math, science, philosophy, language, music, cooking, crafts - anythng at all? If you can get her interested in an activity that will take her mind off the nonsense, that would be helpful. The key is to find the real person living nside the brainwashed cult follower. If she could become deeply involved in a career or community service, it would be gratifying and could be a step toward her freedom.
You sound like a nice guy. You and she deserve to be happy. Watchtower legalism makes it very difficult for its adherents to be happy, to relax and enjoy life. Plan activities with the kids that are fun. Plan fun activities for just the two of you as well. People remember how they feel than they remember facts and rules. You have the potential to do a lot of good and help this woman and her child(ren). Tread carefully.