MR MKHIZE
It is because at the time we called her Mukabai because of her bravery, we knew that if you follow the history of Amazulu, Mukabai who was a sister to Sinsanakona played a very important role ruling this nation giving instructions as to who should be killed and who should not be killed.  She is the one we know very well who instructed that Chaka be killed, she is the one who appointed Dingaan to Chaka's position that is why she ended up dying at Ebakaluzini because of her bravery and deeds perhaps and it is because of those reasons that we referred to Mrs Umbiasi as Mukabai, it is the manner in which she managed to handle things as a woman and we regarded this as bravery and wisdom and we saw the name Mukabai appropriate.  People know very well that a woman who can drive alone in a car, wanted the manner in which she was and when her car approached the ANC people would just flee.