Unsurprised, I think. I mean she has her own issues about Mina to deal with first. I don't think she's ever been quite as confused or scared of her own feelings. She has been as obsessed with Mina as Mina has been with her for their whole lives. And I think she understood from about the time of the hedge maze incident that there was a sexual component to that obsession. But the hard part is going to be rewriting history to understand that Mina isn't who she thought she was. The mutual nature of their obsession is one thing, but realizing that Mina has always been as dark as she is and not the light reflection is going to shake up her whole universe.