I tend to agree with the therapist. You married a stranger, your relationship is based on lies, cut your losses while you have little time invested, your assets are not that tied up together yet and you have no kids.
Statistically, only 5 to 10 percent of alcoholics make it to long term sobriety and furthermore she is still in denial. There is a very good chance that she will relapse. Even if she stays sober, you don't know that person. Life is short, spare yourself years of misery and find yourself a partner who is loving and honest so you can build a relationship on strong foundations.