Unbelievably angry

First off lesbian couple with a kid. My wife has had a few to many drinks. Our son(4 almost 5) needed to go to bed but she kept play fighting with him so he didn't want to. At one point she leaves the bedroom and says rather loudly that she never wanted kids and that she is so frustrated with him. I had to assure him that she still loved him. She doesn't normally drink but has a friend over and had a few. I'm so pissed.

Update- we had a long chat. She apologized profusely. We have agreed that if any drinking is going on the sober parent will handle the parenting thing so neither of us get to the point where we say something we regret. She also apologized to our small person as well.