Assignment X has an interview with Candice Accola.
Check it all out here.
Here is an excerpt:
ASSIGNMENT X: When you started on VAMPIRE DIARIES, did you know that Caroline was going to turn into a vampire and, on occasion, a major ass-kicker?
CANDICE ACCOLA: I definitely did not know. It was a very wonderful surprise, especially considering that at the end of the opener for Season Two, Caroline dies, so it’s nice to know that I had an opportunity to come back and still be part of the show, but now as a vampire.
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The EW has a video interview with Candice you can check out here