How do you get through to them when it comes to the kids?
The quick answer is... YOU don't.
You cannot make your W see, feel, hear anything that she does not want to. Be it mental illness or not.
I have skimmed your threads and noticed that your wife appears to be ill. That has got to be tough.
All I can tell you is to do what is right by your kids. Most will not understand the R between you and your wife. They will not understand how "mom" could do this or not do that.
If you W is not willing to get the help she needs then you will need to get used to having to deal with her as she is today.
It has been several years for me and XW and I still do not have anything resembling a co-parenting R. My hope and prayer for you is that the two of you can get to that point. All you can do right now...is take care of the kids and let her go.
God Bless, Eric
"The difficulties of Life are intended to make us BETTER,not bitter". "Fear is a prison, where you are the jailer. FREE YOURSELF!" "Life is usually all about how you handle Plan B." - Jack3Beans