It would be ridiculous to say that people haven't been successful getting sober using alternative methods, I think they are a low percentage. Perhaps it will work, who knows.
The red flag of course is that is contains language that lends toward moderation rather than abstinence. I see nothing wrong with her trying it - most likely she is still in denial that she is an alcoholic, and still trying to see if she can moderate her consumption. She's just going to have to play the game to the end if she is ever going to stop.
You never know what it is that will bring someone to the point of accepting they cannot control their alcohol consumption.