Yes. The two are separate issues.
If she can provide a very good reason to the courts, I don't see why not Only if they are abbusive or doing wrong things to that child.
Your custodial parent can collect unpaid support that accrued under an order. Support sometimes continues after the child becomes an adult if the child is disabled.
Under federal law, the office of child support enforcement is required to represent either parent for a modification of support, upon request.
Usually the state law of the state that issued the support order would control. Look at the support order. Type your answer here...
In such a case, child support will continue to accrue under the terms of the order until the order is modified, suspended or terminated.
In general, no. Child Support and Custody/Visitation are separate issues and addressed in separate court orders. A parent who is under a child support order must petition the court for a visitation schedule. For more accurate information please specify your jurisdiction.
If not covered under state law, then it must be stated in the child support order. See link below for laws.
They would need to be under a legal guardianship and the parents under a child support order.
Typically, no; if you're under court order to do so, however, get an order terminating support (and setting the amount of arrearage, if any) - do not simply stop paying on your own.
Generally no, it fully depends on the wording in the order.
The child doesn't receive child support. The custodial parent does. The state of MS normally orders child support through the age of 21, if the child is still in school. However, there are situations that would be cause for termination of support. For exampe, if the child "cohabits with another person without the approval of the parent obligated to pay support". You can find the laws regarding this under MS Code 93-11-65(8a).
I believe your attorney is the one who is responsible for this, so you need to contact him or her and have this rectified. If the issue was not addressed in your divorce proceeding then you will need to petition now for a child support order. If child support was addressed and an amount set under state child support guidelines then you can request a copy of that order by visiting the court.