<P> Sofia Vladimirovna Vassilieva ( born October 22 , 1992 ) ( Russian : София Владимировна Васильева ) is an American actress . Her most notable roles include the children 's book heroine Eloise in Eloise at the Plaza and Eloise at Christmastime , Ariel DuBois in the Emmy - winning TV series Medium , and teenage cancer patient Kate Fitzgerald in the 2009 film adaptation of My Sister 's Keeper by Jodi Picoult . </P>
<P> Sofia Vladimirovna Vassilieva ( born October 22 , 1992 ) ( Russian : София Владимировна Васильева ) is an American actress . Her most notable roles include the children 's book heroine Eloise in Eloise at the Plaza and Eloise at Christmastime , Ariel DuBois in the Emmy - winning TV series Medium , and teenage cancer patient Kate Fitzgerald in the 2009 film adaptation of My Sister 's Keeper by Jodi Picoult . </P>
who played kate on my sister 's keeper
who played kate on my sister 's keeper
Sofia Vassilieva
Sofia Vassilieva