"Of course, the black lady lost."
As well she should have - if she wants to be selective of who she rents to on the basis of something so petty as the colour of their skin, then she shouldn't be renting, period.
As I mentioned earlier, being selective for certain valid reasons (such as excluding known offenders, etc) is one thing; discriminating over skin colour is another, and wrong - no matter how you slice it. We preach morality (for the most part) on this forum, and the idea that anyone here would want a law to protect bigotry is ludicrous.
If you dislike someone because of their skin colour, you're entitled to feel that way. Don't impose your prejudice in a public venue and expect to get away with under some banner of "freedom of assication".
It is her private property. She should be allowed to rent to whoever she wishes and deny rent to whoever she wishes for any reason whatsoever.