She was an uppity woman. Walking around with no burka. Probably drove a car too!
It's an insane death cult. And aside from that, non-Arab Muslims, particularly converts, have never been considered "as Muslim" as Arabs (first of all) and other Middle Easterners (in second place). In Spain during the Muslim occupation, Arab/ME Muslims frequently turned on Spanish Muslim converts, and were also extremely hostile towards North African Muslims. The latter reciprocated by being equally hostile - and were better fighters, so they eventually won out over the ME Muslims.
There is a major hereditary component to Islam. The best thing is to claim that you're one of Mo's relatives, and the next best is to be able to claim that you're from the same population group.