Hey darling! It's wonderful that you're revisiting this character. <3
To answer your question, however: In Emily's case, it's as it is for any character this question is asked about; i.e, as Emily interacted with other students and has already established a history for herself at the castle (however small it may be), it would technically make things a little wonky timeline-wise to do that (and a little odd for anyone who might've interacted with her), so it isn't generally allowed.