Wife having emotional affair part 4

[3kids]

Hi all, I haven't posted this much in a while. But a lot is going on right now.

I have a very delicate situation going on. And I'm looking for advise on how to handle it.

In our house we believe in spanking and time outs. Some thing happened that has only happened once before with the wife a very long time ago. She slapped one of the kids. Apparently she had a very very bad weekend with the kids(kids told me). She was very angry with them and emotionally unstable. I know this because one of the clues was that she was working out at home(which she never does, stress reliever usually). And my daughter was trying to push her to work hard as I do with them. And she exploded on her. Now my daughter is very good at pushing her moms buttons. My wife supposedly slapped my daughter twice this weekend. Of course my daughter emotions are high and does not want to ever go back to her moms and hates her and every thing. I even asked my oldest what all the truth was. And he said the daughter pushed the buttons but mom was a little out of control. I know her stress level is high with the selling of the house and life finally being forced on her.

How do I bring this up for discussion? This one is really tough for me!!!!! I don't believe she is a bad mom and I don't know if it will ever happen again.