I second the idea of reading AmyC, job's homework assignment includes a link to her postings. She survived a MLC and describes it with as much detail as she can remember. She affirms that her mind was a total mess during her MLC. A "head full of garbage" is what she described.
I read your thread. Has your wife said "I love you but I'm not in love with you anymore"? Don't be surprised if that one comes along. Something else she might say that is total MLC script is "For the first time ever, I am taking control of my life".
As for her behavior affecting the children, be prepared that it may get worse. The more she goes off the rails, the more she WON'T see how it affects the children. Some MLCers keep it together in front of the children, some MLCers remain decent parents, some MLCers check out from their kids entirely. That's where you come in - to be the sane, stable parent. Just spend time with them and love them.
M: 51, W: 47 T: 22 M: 15 S17, S13, S12 BD: Jan '16 W files: Oct '16 D final: June '18