Remember, in the good old days when they busted the brothels they took away the madames, not just the girls and their johns.
I see no difference in what needs to be done here.
The adult women they "took", kidnapped, forced into vehicles at gunpoint and held against their will, were mostly 18 to early 20s. One was 27.
Now explain to me how even a 22 year old woman "grooms" even the oldest of her children, who will be 7 in the most extreme case, for early marriage to an older man.
Explain how they make that stick in court? Even a drunk defense attorney will be able to poke holes in the testimony of a seven year old, and some of these women had an oldest child who was still a toddler. There are going be 5 to 10 cases of CPS taking adult women by force and holding them against their will under circumstances that would be kidnapping if anyone else had done it.
Now even if there are women who were "grooming" their children for improper relationships, the problem with your theory is that this has not been charged. Even if it is a valid complaint, which I doubt you will find, CPS and LE can't hold people indefinitely without filing a charge against them.
The rights of these people have been so trampled that I doubt any charge can stick.
Except for that niggling little matter of no criminal charges having been filed anyway.
L