Board Thread:Spoilers!/@comment-4877635-20150218173447/@comment-25926288-20150422025327

Utter solitude wrote: Where is this idea that she's the opposite from?

We've already seen she's not- in their youth, they were both emotionally fragile girls seeking acceptance and friendship. That kind of thing has made Emma who she is, and will have done the same to Lily (albeit differently, she had a stable family) and doesn't exactly go away easily. Since they think that Emma is all light and Lily is darkness, for some reason they have to be opposites, even though they could be the exact same.