Mirrorverse: Pure Of Heart by Dawson

Step into the Disney Mirrorverse, a brand-new realm full of endless adventure, where mirrored reflections of beloved Disney and Pixar characters are amplified and transformed, becoming battle-ready Guardians that must unite to defeat a powerful evil that threatens their home worlds and beyond.
Set in a fantasy land that is familiar but slightly changed, the story begins as Snow White helps a young deer in the forest. This isn’t the Snow White that Disney fans know: she has been recently transformed by the creation of the Disney Mirrorverse and given magical powers that she does not yet know how to wield. Despite her new abilities and the strange things happening in her world, Snow White, or “Snow” as her friends often call her, has been carrying on as normal…until now.
As she returns to her cottage, Snow spots her seven friends with dark, angry expressions, and glowing white eyes. They attack her, claiming they need to capture “the heart of Snow White.” Snow desperately tries to reason with her friends, but they refuse to listen to her, and she ultimately has to use the strange magic she has recently acquired to fend them off. 
Snow is horrified when it seems that she has accidentally killed her friends in her attempt to protect herself. It is only when a strange talking creature, who she learns to be Sorcerer Mickey, the ruler of the Disney Mirrorverse, arrives and explains that the creatures she defeated were not her friends. They were a group of Fractured: evil copies created by Dark Magic. Snow believes that the evil Queen has taken her friends, and it is up to Snow to retrieve them and the Fractured Mirror, the source of the Mirrorverse’s power, before it can be used to destroy Snow’s home world forever. 
But Snow doesn’t need to face the Queen alone. Mickey assigns her a team of Guardians, powerful beings from many different worlds who have committed to thwarting the Fractured and protecting the Mirrorverse from evil. Snow meets Tiana—an expert potion-maker—Rapunzel—a fighter who knows how to wield a frying pan—Stitch—a chaotic blue alien who can change forms—Sully— a monster with a big heart—and Hades—the lord of the underworld, who has offered to join the mission to see what this whole “Guardian gig” is about.
This unlikely crew ventures into Snow’s world, where they find growing Fractured, a determined huntsman, and a newly poisoned dark forest. On the way to the palace, each character faces a challenge seemingly created just for them.