One book that has a similar protagonist and writing style to "The Mirror Maiden" is "The Night Circus" by Erin Morgenstern. The book features a strong and unique protagonist named Celia Bowen, who possesses magical abilities and is trained from a young age to compete in a game of magic against a rival opponent.

Like Aurora in "The Mirror Maiden," Celia is on a journey of self-discovery and personal growth as she navigates the magical world around her. Morgenstern's writing style is often described as surreal and dreamlike, much like the descriptions of the mirror world in "The Mirror Maiden."

Both books also feature strong themes of love, hope, and the power of the human spirit. Additionally, "The Night Circus" is a gender-inclusive book, meaning that it would appeal to both male and female readers with its universal themes and relatable characters.

Overall, "The Night Circus" is a great recommendation for readers who enjoyed "The Mirror Maiden" and are looking for a similar book with a similarly strong and unique protagonist and a surreal and magical setting.