Wow, thank you all for the responses.
@LexieCat, yes she knows she has a problem and it isn't a recent one. I want to believe she is sincere when she says she wants to change but I'm so scared that the pattern will continue. She was very apologetic in her own way last night but we haven't spoke about any changes that will be happening.
The scariest part is removing myself from her emotionally and letting her fall. That seems like it needs to happen but it something I would hate to watch.
Thanks again for all the responses and I hope to still attend the meeting on Thursday.