Board Thread:Spoilers!/@comment-4877635-20160722094328/@comment-4453062-20160809145538

Jessy Schram posted this on both her Twitter and Instagram: https://www.instagram.com/p/BI4KY-DgbhI/

An actress named Mekenna Melvin commented on the Instagram post:

"Haha I took this same picture too!!! Smart minds think alike."

This of course points to Mekenna Melvin being in the episode, cause why else would she be on the set of OUAT? Her IMDB page shows that she's done quite a bit of work, so she might have an actual named role in this episode: http://www.imdb.com/name/nm2567203/?ref_=fn_al_nm_1

If I had to guess, perhaps she's playing Drizella, who is one of Cinderella's step-sisters?