i can totaly see where you are coming from on the coercion thing and relating it to religious manipulation....

that said, your idea to have it be the daughter(s) talking their mother into the snuffing would actualy kinda be hotter to me.... maybe a spoiled brat kind of girl who's used to getting her way making a scene and crying begging for it to get snuffed herself, or cajoling her mother into getting butcherd for her pleasure and the giving and loving mother folding under the pressure and accepting... "come ooooooon let me get snuffed!" or even "but you proooomised you'd die for me..." sort of thing.