Grey’s Anatomy Season 7 Episode 3 (Grey’s Anatomy s07e03) with title “Superfreak” aired on Thursday, October 7th 2010 at 09:00 pm via ABC Network.
Here is summary for Grey’s Anatomy Season 7 Episode 3 :

When Derek receives an unexpected and unwelcome visit from his estranged sister, Amelia, issues between the siblings — both past and present — come to the surface; the Chief tries to help Alex when he notices that he’s refusing to use the elevators after his near-fatal shooting; and Meredith and Derek continue their efforts to ease Cristina back into surgery after her post-traumatic stress