The Memory Witch — Heather Topham Wood

Ten years ago, Quinn Jacobs' mother made a bargain with a local witch-steal away Quinn's memories from the first eight years of her life and in return, Quinn would spend a year in servitude to the witch. On Quinn's eighteenth birthday, she's forced to leave her home and friends behind. For the next year, she'll live at the Chadwick House, learning everything she needs to know about being a spellcaster. As her powers grow, Quinn begins to unravel the secrets of the past and the reason her mother was so desperate to conceal the horrifying truth.