Board Thread:General Discussion/@comment-5821891-20131031221624/@comment-5370037-20150404002842

Well, according to the latest comic, the Red Queen was in Wonderland as far back as 8 years before the Curse since Grace was 2 years old during the comic's events.

So if Anastasia IS Cinderella's step-sister the first scene of the episode the Price of Gold had to have happened 8 years before the Curse.