Yeah, she totally was looking at Vaughn strangely after she mentioned Nightingale. It was like she was expecting it to mean something to VAughn. For a minute I thought he was going to say something like that was his dad's nickname for his mother or something like that.
I don't know about her being a Derevko. She doesn't look Russian at all. She doesn't look like a Derevko. Sure she acts creepy like a Derevko, but I don't know. I guess we will see.