The Mermaid in the Shot Glass by Hailey Edwards

The time has come for Ana to conquer her doubts about her heritage and discover her inner dragon. Her lessons begin with summoning fire on the shore at Lendman Park, placing a buffer between her fledgling powers and town. Her flames prove eager to please, leaping to her fingertips, but a sudden burst of magic topples her and Rían into the lake. A lake one of the locals swears is inhabited by a mermaid.
Too bad the mermaid lore isn’t the only story making the rounds in Brentwood. Rumor has it that Mercer Bates has challenged Carmichael Sartori for control of the Sartori pack. Ana doesn’t want to care whether Carmichael lives or dies, but our hearts don’t always listen to our heads. And that proves doubly true when someone Ana considers a new friend reveals her true loyalties in an explosive betrayal that shakes the foundation of the Walsh clan.