Well, I have already made some comments. Here they are again.
I don't see how the lack of prosecutions for fgm has any bearing on a case of a a woman mutilating her husband. The law does not work that way, nor should it. They are separate crimes.
I believe this woman should be imprisoned. You cannot go around cutting bits off of people, any bits. I believe her case will be looked at again in several years' time when the specialists in charge of her will be able to make a decision as to whether she will be any danger to anyone if she is released on parole.
Regarding FGM, I believe, and hope, that the first prosecutions in this country for this heinous crime are fairly imminent.