From Wikipedia, the free encyclopedia. Sofia Vladimirovna Vassilieva (born October 22, 1992) is an American actress. She is best known for playing the children's book heroine Eloise, in two made-for-television movies, Ariel Dubois in the Emmy-winning TV series Medium, and the cancer patient Kate Fitzgerald in the 2009 film adaption of My Sister's Keeper by Jodi Picoult.
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