You either is or you isn't. You can't will yourself another race no can you have an operation to remove the offending genes.
She is a fraud. She lied and if she didn't mess with her body and hair, she'd be as white as milk. Very odd. It's not as if she was brought up in Africa or Jamaica etc. She is latching onto a US version of 'black' which covers a lot of territory.
Did she say where 'her family' were supposed to originate from?