As a woman who is of mixed race, being from a Caucasian mother and a West Indian (Jamaican) father, I can honestly say I have had the best of both worlds and that we are all the same on the inside.
I have never understood why people make a judgement based on skin color and there always have and will be people like that.
My mother used to get terrible abuse believe it or not, from the black community, for 'stealing their men' and the same abuse my father got for dating a white lady.
Unfortunately they did not stay together due to personal differences, but while they were they fought for their relationship and that is an important factor. I think at some point you have to fight for any relationship but it is a shame if other peoples opinions have caused you to have to fight rather than it being a normal problem.
People can be so ridiculously ignorant.
Your friend needs to be happy in life, and if that means she falls for a black, white, purple, or even green man then I say good for her. She might have to fight for it, but what don't you have to fight for nowadays