When she first came out of the vault, Sybil (Nathalie Kelley) seemed like a total monster. She even had the claws and shriveled skin to prove it.

But now, we’ve seen a different side to the siren, and her backstory is just tragic enough to make us feel sorry for her. We reserve the right to totally take back that sympathy, however, if she actually ends up erasing Elena (Nina Dobrev) from Damon’s (Ian Somerhalder) memory altogether.

Now that we know nanny Seline (Kristen Gutoskie) is actually a siren in disguise, and Cade (Wolé Parks) has plans for Stefan (Paul Wesley), we’re pretty darn nervous about whatever Sybil is up to, so we asked Nathalie Kelley to shed some light on the subject.

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Do you think there’s still a little good in Sybil, or has becoming a siren turned her completely evil?

I think at this point, if there is good underneath all that evil, it’s not surfacing quite yet. There’s still a lot more evil to come. You know like an onion, there are layers you have to peel. We have to peel through some more layers of evil before we find the good.

I mean, she’s flawed, and I like that people are having more compassion for her now after seeing her backstory, but she’s definitely not on a path to redemption any time soon.

What is that sister relationship like between Sybil and Seline?

It’s interesting in that it mirrors the Salvatore brothers’ relationship, where there’s so many layers of complexity. Who’s the good one, and who’s the bad one? It’s a lot more complicated than it seems on the surface. There’s a lot of interesting parallels, and it’s just really brilliant writing on Julie’s part.

Seline did try to save Sybil, so can we assume that there’s still some love between them?

Yeah, it’s this really complex dynamic. She says, “My sister will do anything for me,” but at the same time, there’s so much resentment between them. It’s going to be interesting for viewers to see how that relationship plays out. There’s a lot of love there, but there’s a lot of simmering resentment.

How much of what Seline is doing is out of obligation and a need to maybe redeem herself after what she did? It’s just interesting and complex, like all sibling dynamics are.

Can you tell us anything about Seline’s plans for the twins and whether Sybil is in on that?

I think at this point, Seline’s plans are her own. It remains to be seen. I can’t really give away whether Sybil becomes a part of that plan, but at this point in the show, this is really Seline’s own doing. This is her own plan, separate from Sybil.

Sybil has been messing with Damon’s memory a lot lately. Can we expect more of that?

Yeah, it’s just part of her really intricate mind control. That’s how she makes people 100 percent loyal to her, she goes into their brain and rearranges their memories. It’s really important to her that she has Damon’s full allegiance, but Elena is standing in the way of that. So she’s going to try to rewrite as much of that as possible. I know the fans don’t like me for it, but she’s a villain!

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I would think they’d like it, since we get to see all those moments again.

Right, it’s pretty trippy doing them and watching them for reference. Putting on Elena’s clothes — it’s just a really interesting thing, as a person and as an actor, to do that.

Sybil has had some great scenes with Stefan lately, but what’s her interest in him all about?

In the last episode she really held up a mirror to him and asked him to really look deeply inside it and ask some serious questions about himself. I think something about getting Stefan to admit that he hasn’t always been the good brother is satisfying to her, and it confirms something about her own story. She at one point was the victim and was forced into this life, this existence by her sister. There’s something about getting Stefan to admit that — that it’s almost like confronting her sister, which at this point she hasn’t been able to do.

And how does Cade factor into this whole equation?

Everyone is trying to have their exit strategy. Everyone has a bit of a master plan. Seline is involving the two girls, and we don’t really know what’s happening with that right now. Sybil’s trying to form her own Plan B strategy, and she’s trying to figure out, “Maybe I can recruit these guys?”

Basically, Sybil is in a deal with Cade. It remains to be seen what she will do with the two brothers, but she’s for sure trying to get out of her deal.

So is Sybil pro-killing the devil or anti?

She wants to get out of this deal of servitude that she’s found herself in. She’s looking out for herself … Whatever it takes, she’ll be on board to do. She doesn’t really have an allegiance to Cade, only an allegiance to herself.

She’s not his agent because she wants to be, let’s put it that way. It was a forced servitude. She was dying and her sister made this deal without her consent, and so she’s been living that for 2,000 years. She’s over it. She might be trying to eye some replacements right now…

“The Vampire Diaries” airs Fridays at 8 p.m. ET/PT on The CW.

Posted by:Lindsay MacDonald

Lindsay MacDonald is a Los Angeles based entertainment reporter with an affinity for CW superheroes. She graduated from Pepperdine University with a major in Media Studies and a borderline unhealthy obsession with TV in 2012. She would much rather spend the day binge-watching ‘The Flash’ or sorting ‘Game of Thrones’ characters into Hogwarts houses than venturing outdoors. TV words to live by: “Never ignore coincidence. Unless, of course, you’re busy. In which case, always ignore coincidence.”