From her blog:
Reading that, you’d think that “YA Romance” was just another kind of contemporary romance, wouldn’t you? Like “contemporary romances” (i.e., now-set romance novels with no strong paranormal, mystery, thriller, religious, etc. plotline) YA romances are required to “focus primarily on the romantic relationship.”
Except, we all know that’s not what all YA romances are. Sometimes they are contemporary romances that focus primarily on a romantic relationship (Anna and the French Kiss, Eleanor and Park, Perfect Chemistry, etc.) Sometimes, in addition to the romance, there’s a lot of other stuff going on, like saving the world from a demon invasion (The Mortal Instruments), or running away from home and falling into a magical addiction (Valiant), or trying to survive on an alien planet after your spaceship crashed (the upcoming These Broken Stars).
Because of this description, a lot of people didn’t enter their YA romances.