I’d tell them I thought what they did was underhanded and to please not brag to me about gaming the system but I’m not sure I’d sleep well at night knowing I’d gotten my niece kicked out of school. She already got dealt the sucky hand of a mother with no rights to her. In the end, this is on the parents, not the kid. Maybe the separation from them and a good education will make her better.
People have to live with their choices and I tend to see people who make these choices as pretty empty. Not a life I’d be jealous of.