Cat Fight (Preternaturals #1.5)

Cat Fight takes place in Zoe Winters' "PretVerse". Greta is a cat therian (shifter). She's been involved with Dayne, a local sorcerer since she sought his protection from her murderous tribe. After a fight, Greta shifts into cat form and refuses to come back out. The events of this story happen after the first novella in Blood Lust (Kept), but the story also works as a stand-alone.

Other Books in the Preternaturals Series:

Book 1: Blood Lust (novellas: Kept, Claimed, Mated)
Book 2: Save My Soul

Preternaturals Shorts:

Dark Mercy (novella)
Cat Fight (short story)