The Worldwalker Trilogy

This world is trying to kill Lily Proctor. Her life-threatening allergies keep her from enjoying experiences that others in her hometown of Salem take for granted, which is why she is determined to enjoy her first high school party with her best friend and longtime crush, Tristan. But after a humiliating incident in front of half her graduating class, Lily wishes she could just disappear. Suddenly, Lily is in a different Salem - one overrun with horrifying creatures and ruled by powerful women called Crucibles.

Lily is back in her own universe, and she's ready to relax with Rowan. True, she almost died in the Pyre that fueled their escape and must hide her magic for the safety of the world, but compared to fighting the monstrous Woven and leading armies in the alternate Salem, life is looking good. Unfortunately Lillian, ruthless ruler of the 13 Cities, is not willing to let Lily go that easily. If she can't persuade Lily to return to her world, she'll have to find a way to make her come back.