Her stepson, Tyler McMillan, died in June 2008 after being tied overnight to a tree.
Investigators say Sandra McMillan, and the teen's father, Bruce McMillan, were punishing the child.
An autopsy determined the teen died of dehydration and a heat stroke.
A judge ordered Sandra McMillan to live with her cousin in Cary and wear a monitoring device. Bruce McMillan is facing similar charges and remains in jail with no bond.