True the alcohol is not 'the' cause of her status. But the use/abuse of alcohol is. She's trying to fix or deal with relationship issues with the wrong tool. The right tool for the right job in this case is not alcohol, actually it should never be alcohol or drugs. This is why the rehab community frequently touts coping skills which is what Fiona and others lack. That is the tool they need and might find in rehab, meetings, therapy etc.
Frank had 'a' point but he's not 100%. I've seen alcohol amplify any emotion including anger or mellow. I'm glad they threw in the narcissism line because narcissism is frequently associated with alcoholics.