Locking her up for two years, or even half a year, and tossing her back on the streets will certainly ruin her future prospects for life.
The addictions may have underlying causes. Severe diffuse feelings of anxiety are quite disturbing and overpowering, the victim will go to great lengths to relieve them. Alcohol is a commonly (ab)used anxiolytic, the drugs aren't specified but they too are likely to be anxiolytics.
Anxiety may have several causes, among them clinical depression. This can be confirmed by a psychiatrist, and if that's the case she can be put on a course of anti-depressives. Once free of the depression she'll have a much better chance of taking control of her life and become a useful member of society.
Of course, it's quite possible that the addictions are primary and self-inflicted.