Yeow! So you were trying to have a meeting about your kids while she was self-medicated. I don't think the point of announcing she was drunk would have gone over well if your intention would have been to convince the social worker or your exAGF. However, you could have requested that the meeting be rescheduled and given your reasons why, and then left.
I think you did a good job having restraint. The SW probably has her own ideas but may not share them all with you.