I'm with Karen.

I read your post and what through to me was, not only are you allowing the dog to do whatever she wants, you are handling your family the same way. Time to teach rules and consequences. With 3 children and a new baby, you will not have the time to be the only one handling the dog. Get them all in line now.

Also, look into an obedience class and have ALL the children attend with you and the dog. Ensure THEY do all the homeworks and practices. This will put all of you on the
same page with dog commends and training. Make sure it is a positive reinforcement training school.

I am sorry you are having such a difficult time just now.