if you can get her to watch porn. specifically armature porn. include multiple races and gender sets. Asian women with white men. black men with latina women. etc. evntually add in more black men with white women. you may also try to go to some sex parties or clubs frequented by black men. when there try screwing some black women if there are any there and encourage her to go black as well. you dont want to put all the pressure on her.
i would say primarily keep her away from professional porn.it may scare her away from actually wanting to fuck black men. seeing some small white women being torn in half by diesel or shorty is not lily to arouse her.