You are doing the right thing with minimal response to her ridiculous attacks.
The R that your W has with "The Snake" will fail. She will probably have many more R failures. All you can hope for is that you get primary custody and be the rock for your daughter. You need to be the stable part of her life. D4 will see her mother flounder over the years and this may actually be a lesson in life for her so as to not repeat her mothers mistakes.
Be strong, have patience and keep your eye on the ball.
