Joss Stone

Can someone please tell April who Joss Stone is? Everytime Joss appears on TV, she asks me "who is she ah?". I reply "Joss Stone" and she replies "who is Joss Stone?".
I keep telling her that she's the white gal with the black woman's voice. I went to Joss Stone's website just now and she asks the above question again. I must have told her a million times who Joss is.