No, Elena is not me, Katherine thought smugly to herself. But I can be her, if I want to.
She had been outside listening to the whole conversation. She had been watching the Salvatore brothers (and Elena) for quite some time, without their knowledge. Katherine thought it was high time to have a little fun with them all, rather than remain the passive observer.
Putting on her best Elena sweetness and stifling her smirk, she knocked gently at the door.