My Soul to Lose by YuJiao Chen

In Rachel Vincent's story Kaylee Cavanaugh's trip to the mall ends with a brutal panic attack and a brainscrambling shriek she can't stop. Her secret fear is exposed. It's the worst day of her life. Until she wakes up in the psychiatric unit. But the hospital isn't a safe place for Kaylee, and getting out won't be easy because everyone thinks she's crazy. Everyone except Lydia, who has a secret of her own...