One thing it's best to accept is that without any formal treatment (ie abstinence and working a strong sobriety program), your wife is not going to get any better. In fact she will worsen. You talked about her shorter and shorter sobriety periods and resenting her when she drinks. That is the reality you are faced with when you take her back. She has made it very clear she has no desire to quit or change so basically it will get worse. She will continue to deteriorate. You really need to ask yourself if you are willing to continue to live with this reality. She is not "living the dream" at her parents. Her life is no longer her own anymore, she is controlled by the bottle and when she can get her next drink. Its a very sad existence really because of all around her who are truly hurt by this terrible disease. Good job not responding.