This in vivid contrast to the way the world would suggest she mark this "passage into adulthood".
It's actually quite ironic; celebrating your coming of age, your maturity, your adulthood, by taking mood- and mind-altering substances into your body--so much so that the next morning, you are hard-pressed to remember just what you did and who you did it with.
How much more mature, more adult--in the true sense of the word--to respect your spirit and your body, and to remain master of both. To spend time with people you care about, to enjoy their company, and to have those memories the next morning.
That's the recipe for a happy birthday--and a pretty good foundation on which to build a happy life.