This should be a shocking story, but unfortunately all too common these days (and in the past).
I'm afraid that the best advice I could give is for your friend to move anyway. Be a model minority. Take care of the lawn. Invite friendly neighbors over for barbecues. Be regular folks. And blow their minds about what they are assuming about people of other races. Integrate and infiltrate.
Also, this patient may not be representative of the whole neighborhood. Sometimes the most ignorant folks in a group have the loudest mouths.
Of course, they will continue to hold their racist opinions for a long, long, time. But now they will be able to say comfortably to themselves, "but I'm not a racist because I have a black friend!" And over time, if they are at heart decent, they will begin to feel ashamed of some of their old opinions.
And for you, as a non-minority friend, be sure to help her move and get together a group of friends to help her. Attend those barbecues and support her socially and materially (since it sounds like she will be struggling.)
I am speaking as a minority and a reformed homophobe, converted to a supporter of LGBTQ rights by a now-dear friend who is a lesbian. And this change happened only within two years of meeting her for the first time. My old opinions were due entirely to ignorance.
By the way, this belongs in the Off-Topic forum... see if you can ask the moderators to move it for you.