A mother who had been a victim of FGM discovered during pregnancy would be referred to SS, yes, to protect her daughters. They would try and re-educate her.
SA is not an FGM area. It would have been inappropriate to have this storyline in the SA episode! Male circumcision is a different practice altogether, and comparison is not helpful. I know male circumcision is controversial as well, but it's not related to FGM, the root causes of the practice are different, and bringing it up means that often a conversation about a women's issue gets taken over by people wanting to talk about men. Which gets old. Men men men. Now, back to women.
It is carried out by women. Reputedly, the men aren't that big on having to cut open their wives on their wedding night, or never being able to have sex satisfactorily, actually, for the majority. But an uncut woman would never get a prospective MIL to agree to a marriage. It's a practice run by women. I know it's rare in our patriarchal world that women can come up with something abhorrent all on their own, but sadly they can.
As for removing a girl who has been mutilated from her family, what good will that do? Child removal is not used as some sort of punishment in this country. Once the child is mutilated, they are mutilated. Removing them from their family, everything they've known, will cause more trauma, on top of the trauma of FGM. Why would you make these girls suffer more by removal? If a girl says she has been cut, then SS will of course try and get involved to ensure she gets medical help, and to protect any other girls in the family, and to re-educate the family.
FGM describes a wide range of practice. The full infibulation is relatively rare. Sometimes it's a symbolic cut, or partial 'sewing up'. Different areas have different practices.
I think CTM did well. Not inappropriately putting today's values on the 1960s, yet showing everyone's horror. Also mentioning that it's a geographically small area,and not a religious thing.