Mad Queen by Jewel Killian

Part air spirit, part water. She was the illegitimate heir they tormented for sport. Until she made them pay.

Vestra Rhygaard never liked the sylph court. Maybe it was the corsets and the vicious nobles. Perhaps it was how her father, the king, never gave her anything beyond a callous glance.
Or maybe it was that time someone tried to murder her.
When she’s knocked out, stolen from the woods, and taken to a foreign castle, Vestra decides to stick around and hear what they have to say.
She didn’t expect to fall for them. The roguish prince, his laid-back best friend, and even the brute who kidnapped her all worked their way into her heart. And when she’s forced to leave them to fulfill her duty, she’ll reign terror down on those who refuse to obey her.
She’ll be their Queen. Their Mad Queen.