Is Sandi just paranoid?
 

So, Sandi thinks that Brandi is out to get her. Maybe she thinks that because Sandi reckons Brandi to be a racist. Brandi is rich, white, middle class and Christian. On top of that she has a very healthy reputation in America for being a bitch (see 'My Kitchen Rules' on American TV). But, just because it walks like a duck and quacks doesn't mean that it's a racist duck.