That's a tough call, maybe the racist white woman would have an abortion anyway, even if it was a rape by a white guy.
If a woman were able to tell if she was going to have a Gay baby and aborted it, I guess no one would ever really know why she had the Abortion? Would she tell anyone why?
I guess my point is Abortion CAN be racist for some people in the way you put it, but just to make a broad term that "Abortion is Racist" in and of itself is senseless!