The Gilded Girl by Alyssa Colman, an alternate version of A Little Princess - with magic

Title: The Gilded Girl
Author: Alyssa Colman
Publication: Farrar Straus Giroux, hardcover, 2021
Genre: Middle-Grade Historical Fantasy
Setting: New York, 1905

Description: Emma Harris is brought to New York by her affluent architect father to attend an exclusive boarding school, Miss Posterity’s Academy for Practical Magic, which teaches well-born twelve-year-olds how to “kindle” or start channeling their magic skills as quasi-adults.