First Earth: A YA Fantasy Adventure to Another World by Cami Murdock Jensen

Scarred and reviled. She fought inner demons for years, but now actual demons hunt her.

Agnes was always different. Not just because of her scars, or the nerve damage to her legs… But when she’s whisked through a portal to another earth, she’s sent on an adventure she didn’t expect. Can Agnes find the strength to summon her inner light and defeat this demonic entity? Or will both earths fall before it’s terrifying power…