You beat me to it. I agree to keep the peace, apologize and be civil as a whole but somewhere there's a line of self-respect. A line that baby mommas will cross quite often i'm realising reading these stories, since they, like all women are like children and push until they run into some resistance and thrive in the drama combined with the underlying bitterness of having their big dream crushed.Very good post and it is best for the child for sure.
However i must disagree on what is in black, it is being too accommodating.
I think best thing to do is to follow the signed agreement to the letter. Sometime you wont be able to keep your daughter longer you made other plan and then she will use it to create drama. and make you the bad guy does not matter if you always do more, it does not count in their solipsism mind.
Anyway that was my experience.
When she's starting to blackmail using the daughter and fishing for apologies eventhough she's 100% in the wrong, man i couldn't do that sh1t.