How to engage with a narcissist

So, I co-parent with a partner who has very strong narcissistic characteristics. She is very proud, incapable of compromise, and willing to do ANYTHING to "win" the battle of custody and divorce, regardless of the way it affect our child. I have spent nearly half a decade engaged in brutal legal conflict with her. Including several criminal accusations. She is incredibly persuasive and very talented at making herself appear a certain way to those that don't know her well. In my experience the best way to deal with her??? 1 "grey rocking" is a method of interacting with a narcissist where you simply do not engage or react to their provocations. ESPECIALLY in legal battles the most beneficial thing for them is to provoke a reaction from you and then make you out to be the crazy one. I personally fell for this hook, line, and sinker. Try using ChatGPT or a similar A.I whenever responding to any messages from them. This way you can vent and say all of the things you want to say, tell ChatGPT to re-write it as professional and business like and just like that screw you, you don't even have a soul. I hate you and I can't believe I ever fell for your crap" becomes “I feel deeply misled and disappointed by your actions. The trust I placed in you has been broken, and I no longer wish to continue this relationship.” I have also found it very helpful to make them feel like you acknowledge their superiority. This is a hard pill to swallow, but it will help out in the long run. Especially if you're not exactly batting a thousand with the courts. Something as simple as giving them choices when scheduling a time "would you like to do 12 to 6 or 2 to 8 on Saturday, or I can either pick our child up on Saturday and drop her off or we can do Sunday but then you will have to pick them up at my place. These are just the things that I have learned in my struggles in my nearly 10 years and $100,000 in legal fees battle with two "baby mommas" in the divorce and custody process