I think my next step will be as follows......
I am going to ask lots of questions about her history...i.e. when she went to rehab 10 or so years ago how was she behaving, when rehab was over how was she, when and why did she start drinking again, etc. Lets see what she tells me......
I am also going to talk to the EAP (employee assistance person) at work and perhaps think about attending an AA meeting in my area. I need to try to get as many details as I can before this. She has been very open with me (i.e. she told me about her rehab and all, etc) so I am fairly certain she will be when I ask these questions....