Since Jane writes for all levels, that's probably an accurate statement! ;^) She told me that when we were submitting to WEREWOLVES! and VAMPIRES! (Allie was by then too complex for the second anthology -- she was becoming a book/F&SF novelette.)
I think that anthology was rated YA 10-12 yrs. The term YA must have expanded in the ten years since the anthology. You've sold YA since then, so I believe you. But I read on a 12th grade level in the fourth grade, so I was one of the weird ones. (Nationally -- not among SF/Fantasy readers/writers. A lot of us were like that...)
Re: YA length vs. adult
I think that anthology was rated YA 10-12 yrs. The term YA must have expanded in the ten years since the anthology. You've sold YA since then, so I believe you. But I read on a 12th grade level in the fourth grade, so I was one of the weird ones. (Nationally -- not among SF/Fantasy readers/writers. A lot of us were like that...)