What she is doing, in my view and simply put, is publicly using her daughters to try and justify her actions / farm sympathy for her cause. It's not even done in an outburst of emotion, as the yelling might have been, it's a calculated and deliberate PR move. And it's not right on my book by any means or justification.
If her daughters were already exposed, she should be the first one to try and shield them as much as possible, and not further exploit them and throw them into the limelight. Especially considering that this is basically a conflict between their parents, the girls should not be thrown into the middle of it by one of them.
It may be cool or not cool, but I do feel strongly about parents deliberately using their children for their own PR goals. And I was struck by the original post I quoted because it seemed very strange to me that when it comes to protecting the well-being of children, we were supposed to hold random strangers, who may not even know about them, to higher accountable standards than their own mother