Board Thread:Spoilers!/@comment-1293767-20140317092557/@comment-11464223-20140331172308

Stonicus wrote: Enter Username Here wrote: That doesn't make sense. She was already in the castle when that Flying Monkey gave her Regina's blood. I'm not buying the "Cora's daughter" act, but there must have been another way she got Regina's blood before. The entire castle wasn't protected by blood magic, only Regina's vault...

It doesn't matter, she IS Regina's sister, Lana Parrilla confirmed it...