Bride of the King by Angela J. Ford

Upon her father’s death, Nesrin made a vow never to use her magic. But years later, living under the abuse of her step-mother, she breaks said vow and casts three wishes.
One for wealth. Another for freedom. And a third for love.
The magic is tricky and soon Nesrin finds herself wed to a nomadic king and cast into a new life full of mystery and intrigue.
But just when she figures out her place in the world, the consequences of her wishes demand payment and she realizes the price of magic may cost her everything. . .