Sadie Harris
She was originally planned to be a romantic foil for Callie Torres ( Sara Ramirez ) and Erica Hahn ( Brooke Smith ) , but the role was retooled after the latter departed in November 2008 . 
<triplet> Callie Torres <subj> Sara Ramirez <obj> performer <triplet> Erica Hahn <subj> Brooke Smith <obj> performer