The Fire Queen's Apprentice, book 3: The Dragonfly Oath
Jordan Rivet2020

When Tamri draws the Lightning magic into her veins, she feels powerful. She can finally stand up for herself and the people she loves. But her friends believe the magical substance is too volatile to use. To prove them wrong, she’s preparing to seek help from a dangerous source.

But when an unthinkable disaster strikes, Tamri throws herself into a new partnership. She alone believes she can handle the temptations. With her greatest enemy closing in, she must master the Lightning or lose herself completely.