My daughter is 18 going on 19 and she's not going to school

Unless you are still paying back support, it should already be over, unless she has signed up for college in which case you would not be done yet.

Without continuing her education, your obligation ended when she turned 18, again, unless you are paying arrears.

My daughter is 18 going on 19 and she's not going to school


Trying to fill in the blanks here, what does the Order of Support say?

What State?

Posting the same question with different titles is counterproductive.

I've merged your two threads.

But the answer is in your support order. Most orders state 18 or until they finish school.

Yes, if not in school in most cases it would have stopped on 18th birthday.
You often have to make a motion to the court to end the support.