I am sorry I did not explain self-interest better. You need to explain to your daughter that the choices she will make in life, will determine whether she will lead a happy or unhappy life. That often when we make the wrong choices early in life, we will reap the consequenses for the rest of our life. That you as parents see your job as keeping her from making mistakes that could have long lasting consequenses.
Explain that drinking is a copout. That it causes one not to think straight. That you think that she is bright enough to see that at her age to bomb out with a drink will get her into trouble. And that as long as she is under age, you still are responsible.
Then explain that once she turns eighteen she can go ahead and ruin her life. But then, if that still does not hit her, explain that as long as you are responsible for her, she will have to follow your restrictions.
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