Ok... I know you should perform 50 brutality or fatality on her. I did this but no head. I used the classic tower (with 25 opponents), changed it to one round and fight over 50 times against her with a finishing move by reseting the tower. I am really confused because nothing happens. Is this a bug or my info wrong?

OMG!.. Now I know why I don't got the head already.... I have to perform 50 fatalities on her -.- Damn, I used to do brutalities on her.