They mentioned several times Derek's psychiatrist sister, Kathleen would be coming onto the show for a period of time. My guess is that is who she is playing.
Dude totally. Derek has like 5 sisters or something like that, right? I am totally willing to bet that she's one of them and she's a doctor/suffering from some illness.
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and god, please don't let it be a love interest. i really can't take anymore whiny/dark/twisty meredith.
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I bet it's a relative.
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