still has to receive until 18
No. They do not.
In Illinois, each child support payment is a civil judgment.
no
yes
A child support law in Illinois requires the non-custodial parent to purchase a percentage of their net income child support. The rates are 20% for 1 child, 28% for 2 children and 32% for 3 children.
by paying it until it's paid off.
no
yes
yup
Then she will not get any child support.
Not exactly. In Illinois, child support cannot be ordered past the age of majority but "education support" can be. One or even both parents may be ordered to pay education support, based on the child's academic expenses. Education support must also be ordered by a judge, separately from a child support order.