Well it's obviously a woman being abused because the elders are advising submission whereas the logical thing to do is stand up for herself.
As she's controlled by the cultish teachings of submission to her husband no matter what kind of monster he is her mind is locked in his control by her belief system.
You can only advise that the right thing to do for her children as a JW is follow the concept of love. Love for her children so she can stand up to the abuse having their best interests at heart. As she wont hear criticism of the elder's advice remind her she shouldn't reward unloving and perhaps 'unchristian' behaviour in her husband by submitting to his abuse.
Good luck! Someone under this level of mind control is not going to be easy to help.