From my warped perspective, I didn't read bitter or angry in this post.
I read a guy trying to stay balanced and keep his emotional bubble in the middle. That's good.
Do you know now that she asked for the favor so she could hand you some D papers?
It's a coparenting business arrangement now. Treat it as such. How would you negotiate a win/win deal in a business matter?

Just for kicks Jeff, what's your GAL this week? You know I wouldn't want you to think I forgot or didn't care enough to ask. ;\)

Live your life while you are still living.
Riding the trail less traveled.