[Endoperez]

What makes vampires ethereal in the first place?

If it is a cloak (someone mentioned something about vampires and cloaks, thanks for him!), giving the Queen body armor would take the etherealness away. Make any weapon take away her life-draining attack, and take away one of her miscellanous item slots. She can't drain the blood if she whacks her enemies down with a sword, and surely some of those abilities come from magical amulets...