JayR,
You only have this 24 hours to work with, don't squander today worrying about the future you had planned. Your wife will quit when she is ready to do so. That may not happen soon, but you have taken the first step - drag the topic into the open. It seems you instictively know that her desire for secrecy is dangerous. But don't kid yourself that you can prevent her from drinking. That's a fools errand. Find a local therapist or doctor with whom you can discuss what is happening and how best to approach this issue. Involve your wife if she seems inclined to want to change (though it sounds like this is not currently the the case).
Most of all, don't despair. You have a limited amount of time and energy, regardless how this plays out, you will need it. Most of all, seek help from others who can assist.
Best of luck.