Speaking from the other side of things, you're going to drive yourself crazy trying to be the booze/money police. There are steps to be taken in order to avoid enabling - and folks here have good experience with that. But other than that...
When I was an active drunk, there was no stopping me. I had the secret cash accounts that the wife didn't know about. I had booze hidden in some damn creative ways.
If she is indeed an alcoholic and wants to drink, there is absolutely nothing you can do to stop her. She will find a way.