User blog comment:MarthBoy606/Hints for the rest of Season 2/@comment-25968390-20160227051544/@comment-25968390-20160227112618

Are you sure? This link from the Touhou Wiki states everything you need to know. It even states her species as a humanoid ghost, which should be enough connection to King Boo. Not enough? They are also of some kind of royalty. Understand? Sorry for the initial confusion...