If you haven't had to fill out a financial affidavit, you will in the near future. Since she has a law office behind her, they know ways to make your life a living hell (like providing 5 years worth of financial information for everything).
Be transparent with anything that has a paper trail. Call the appropriate sources and get the statements. As wacky as it sounds, good will helps you and her.
This time isn't about drawing a line in the sand. It's about finishing the process as quickly and equitably as possible. Look what my ex did.. spent 140K on a basic settlement of which I am responsible for half. Emotions fly high and unreasonable behavior becomes the norm.
Take care of the kids. Meet the requirements of the law. Throw in a bone which makes you sound more than reasonable and puts the pressure on her from her lawyer that she's getting a better deal than if she went to court.