It is very true that the first step to getting better is admitting that there is a problem. As long as your wife blames others for the problems in her life, she cannot take control of the situation. If others are to blame, she cannot change them because she cannot control them. From your description, she has a substance abuse problem. In her suffering she is hurting those around her.
She is misperceiving reality. You cannot trick a therapist into “siding with you.” She rejects your interpretation of the problem and she rejects the therapist’s interpretation because it differs from hers. Since she believes that she is right, she needs a rational explanation for why the therapist agrees with your assessment. She knows that the therapist is both well educated and intelligent. So why would the therapists with all of their training and intelligence agree with you? Because you have tricked them.
There is often more to a story. I would need to hear your wife’s version of events. It makes it impossible to provide specific advice without it.
I’m not sure what you meant by the expression “nearly out.” I interpret it to mean that you cannot or are not willing to tolerate much more of her behavior and are considering ending your marriage.
Three things that you might want to consider before deciding on divorce are: 1) individual therapy, 2) an intervention or 3) a short separation.
A therapist could gather many more details about your relationship and assist you in determining your next move. Ending the marriage could be particularly traumatic for both you and your family. It’s important to have a great deal of support when considering or pursuing such matters.
Couples therapy may have been ineffective but perhaps she would be willing to enter treatment for her drinking. If she’s unwilling to go to rehab, then an intervention may be necessary. An intervention would involve confronting your wife, in the presence of concerned friends and family, describing how drinking has negatively affected your family and your marriage, and asking her to enter treatment. Should you choose to pursue an intervention, it would be advantageous to consult a family therapist or professional interventionist before attempting it on your own.
Finally, you might try a temporary separation. Being apart might afford you the opportunity to gain a much-needed, fresh perspective about the relationship. Ending your marriage should be a “last resort” option, after you have tried everything within your power to keep the relationship together. Please take care.