This is a great question, we should put her life under the microscope and examine it.....
I'll use Enneagram/Socionics/Kiersey/Temperment and typical crap
Answer these questions.....
1) Can you give a description of her behavior/personality in non-technical terms
2) What do you know about the current events of her life
3) What do you know about her youth
4) What enneagram type is she
5) What Socionics type is she
6) What Kiersey Temperment is she (Guardian/Rational/Idealist/Artisan)
7) Is there any guesses as to what triggered the drinking
8) How do you know her, what is your relationship with her
Attempt each of these question and I'll give you my synopisis/analysis of the situation