This is all pretty academic as usually when a divorce occurs, one or both spouses eventually "remarry." The only reason that wouldn't happen is if one spouse was truly traditional Catholic or couldn't remarry because of children or poor physical appearance. The couple in the story was novus ordo so my prediction that if a divorce occurs, the wife will get bored and "remarry."
When Novus Ordo Catholic couples divorce, they are often recommended to seek an annulment. Sometimes with an annulment, the guilty party (the alcoholic, abuser, or adulterer) is not allowed to remarry, but at other times, they are permitted to remarry if they successfully seek counseling and/or spiritual help. However, some of these couples never seek an annulment because they have lost the faith due to their brokenness, financial ruin, etc.
I have known couples who have sought an annulment in good faith following the advice of their priest, only to have mercy shown to both the guilty and the innocent party, but then the innocent spouse becomes upset over the mercy shown and loses the faith. However, in these cases, priests have said that there is no truly innocent party as we are all sinners in need of mercy.
Sometimes separation is good as it might bring the alcoholic spouse to his senses, but divorce can lead to financial ruin.
Perhaps if the lady would separate and pray for him that might bring her husband to his senses.
In the Eastern Catholic Churches, there is a practice of praying to Our Lady the Theotokos of the Inexhaustible Cup.https://parma.org/events/akathist-to-the-theotokos-healer-of-alcoholics
I used to have a small prayer pamphlet that is obtainable with these very prayers to the Theotokos.
They are powerful. Many alcoholics have been cured when people pray for them.