They do look similar!  But in fact they are not the same girl:    https://www.facebook.com/serafinaandtheblackcloak/videos/serafina-and-the-twisted-staff-book-trailer/996156760501105/ :  Author:  "My two daughters played Serafina and the new character Lady Rowena [for the book trailer for Serafina and the Twisted Staff.]"  The girl in the music video was apparently played by an actress from Spain, Laia Manzanares. There's something about a Standard Hotel connection to the Biltmore Estate otherwise, though, I have a feeling.  I have no idea how.