<P> Sofia Vladimirovna Vassilieva ( Russian : София Владимировна Васильева ; born October 22 , 1992 ) is an American actress . Her most notable roles include the children 's book 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 ( Russian : София Владимировна Васильева ; born October 22 , 1992 ) is an American actress . Her most notable roles include the children 's book 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>
the girl who played kate in my sister 's keeper
the girl who played kate in my sister 's keeper
Sofia Vladimirovna Vassilieva
Sofia Vladimirovna Vassilieva