So, I confronted her on the "Poisoning of the Well". It went like this:

Me: I'd like to talk with you about the kids.
Her: Let me finish up what I'm doing.

A few moments later...

Me: We had agreed that we would split 50/50 the placement, custody etc. of the kids.
Her: Yes we did.

Me: The kids have said that you told them that they would spend most of the time with you. They also said that you told them I don't like your family, that I'm mean to you, that I yell at you, etc.
The courts call this "Interference".
If you, your friends, your family, whomever continue this behavior, I will take this to the courts.

Then the Alien Speak...

Her: You know, I can twist what they say about you, around to, you know, blah, blah, blah, blah...
I didn't think you would really get your own place, blah, blah, blah, blah...

Me: Anyways, I have a lawn to finish mowing.

And I walked away...