@ecureilx, it's all about assumptions and a lot of them have been made in this thread including your post. What I said earlier was based on the OP's opinion about the maid (being good in general). I know it is very difficult to find a good maid so I would be inclined to give her some credit rather than immediately starting to speculate what kind of whore she might be and whether she is that irresponsible to try to handle intoxicated my kids. If I had reasons to believe that what she does is anything beyond spending her time with her bf who buys her a beer or two, she would be fired immediately.
It is a classic double edge sword argument, and to your post and wife's opinion one could say: you trust her that much to let her take care of your kids and live together with her under the same roof, yet you don't trust she would behave when going out in her free time. What kind of logic is this?
As I mentioned It goes two ways, you can try to figure out a bit further what kind of person is she and what are her reasons or to fire her with all the consequences including a very real risk of getting someone even worse.
(a typo corrected)