Now that I've slept on it, and the shock has worn off, I can see things more clearly.
I think Nuudawn has hit the nail on the head, I don't think she can socialise without drinking.
When I look back she always had a drink in her hand at parties even when most people weren't drinking. It was like she didn't know what to do with her hands if she wasn't holding a drink. Not that I have talking room, I used to be the same.