An early review of The Cowboy Girl pointed out Caroline Lockhart's lack of public recognition in a curious but insightful way: she has no wikipedia entry. Likewise, she'd probably never served as the inspiration for a Halloween costume... until this year.
(Update: Becky provides a better picture mimicking the book's cover.)
Way to go, Becky Hill! I'm always interested in feedback, via info at johnclaytonbooks dot com