She was black so that means she can't be British.
Her citizenship is British, her ethnicity is not, nor was her outfit. Imagine wearing an outfit that screams to everyone "I'M AFRICAN!!!" because you're proud of that fact and then getting offended when someone takes an interest and asks a friendly question, and then you turn around and complain in the newspapers about it in order to destroy the person who asked, who then gets canceled from her position because this hateful woman weaponized white guilt for her own vengeance. Not to mention the fact that her charity only helps people in Britain from her own race.
She also complained that the royals are racist because none of the portraits in their halls feature black people. She's a troll.