DB,
It means that she was drunk... again. This time she had a good excuse (not that she wouldn't have otherwise) because you are criticizing her and upsetting her and if you had her life! ...you would be drinking too!!!!
(This is how alcoholics think)
What I mean by this being the tip of the iceberg is that what you are seeing from her now is not all that is really going on. The thing with alcoholism is that it never stays the same, it ALWAYS gets worse.