I know she would never place our child in danger, and I am unaware of any time that she has been drinking around them in an uncontrolled manner
perhaps not intentionally but as addiction progresses, the behaviors of the addict become less predictable. and risky. she is most certainly drinking MORE than you are aware of - and she is drinking more often than just at night. since her tolerance is already all over the map, and by your own admission she turns into a mean, nasty, angry person when drinking, it is NOT a far stretch to imagine how things could get out of control VERY easily, and very quickly.
as mentioned above, would you hire a babysitter who drinks like your wife does?