Child support ending at 18

My step daughter turned 18 this month and is still in high school. She graduates in a month or so. My question is that in their agreement it just says he is ordered to pay support for the minor child. It does not say until she graduates high school or any other time frame just the “minor child” part. I have not sent her child support this week since she turned 18 and her mother is saying we have to pay until she graduates. Can you advise me of what we should do ?

The statute on child support is specific about the duration of child support. If your agreement does not say when your obligation is supposed to end, you should follow the law and provide support until she graduates from high school.