I am not sure she claims to be white. Her dad Alfred Roy Carey, an aeronautical engineer is of African-American and Afro-Venezuelan lineage. She might be like Kapernick and Holly Berry-—raised by the white side but identifying with the POC side.
-—I am not sure she claims to be white.-—
What she claims doesn’t matter to the joke. I’m 100% white and I’m darker than she is.