Taking the emotion away - bitter divorce or otherwise.
You have
a legal obligation to pay until your daughter is 19. I do not know about
maintenance when at university.
It makes no difference whether
you have
contact with your daughter
or how other people have behaved.
The facts are: the Csa will
assess you at 15% of your earnings for 1 child and 20% for 2.
If
you choose not to pay they will take legal proceedings against you. This
can ultimately mean a criminal record.
You will not be dealing
with your ex but with a third party so "fighting her tooth and nail" is not
the reality.
The only way the csa stops is if your x stops it -
and from what your brief post says that is unlikely.
I am not
asking you to rolloverbut to bite the bullet and not make it harder for
yourself
X