Was there a Mary Janice Davidson book or short story between "Undead and Unreturnable" &"Undead & Unpopular?

I just started reading "Undead and Unpopular" but there seems to be details that weren't included in the previous book (like Garrett's mate, the psychic werewolf). Was there another book or short story that would've introduced her even it it wasn't part of the actual series?