I do not believe that Sarah Paulson is Jewish. Her wikipedia does not mention it, and a general Google search returned no such fact. Are you sure about that?
Interesting, though, that you bring her up. Because while she is the appropriate ethnicity for Linda Tripp (Impeachment, and American Crime Story, currently airing on FX), she is not the appropriate size. But it's not the actor's responsibility to take or not take roles they are not appropriate for, it's the director's/producer's responsibility to be aware of such issues and cast them appropriately. So I lay the blame here with Ryan Murphy, not Paulson.