The Lumbering Giants of Windy Pines by Mo Netz

In this debut spooky adventure, Jerry and her trusty wheelchair move into a creepy motel at the edge of the woods where nothing is as it seems. When her mom disappears, it's up to Jerry to brave the forest and its demons so she can save what's left of her family.
Ever since her dad died, 11-year-old Jerry Blum and her mom have bounced around dead-end towns, staying in a series of rundown motels where her mother picks up housekeeping work and Jerry can get around in her wheelchair.
But the Slumbering Giant motel is different. Lights blink on and off in the surrounding trees, a mysterious radio station plays only at midnight, and people disappear into the woods, never to been seen again. Not to mention that Jerry's mom keeps vanishing to do "special work" that she refuses to discuss. When her mother doesn't come home one morning, Jerry springs into action.
Luckily, she's not alone. Paul, a pocket-size imaginary dragon, and Chapel, a new friend with a penchant for the supernatural, join Jerry's search for her missing mom. But along the way Jerry discovers her mother's terrible secret: she's not a housekeeper at all; in fact, she's been defending the town from demons that have been haunting it for generations.
Armed with nothing but a Ren Faire sword and a backpack, Jerry and her friends venture into the forbidden woods to save Jerry's mother. But the "demons" hiding there aren't what they seem, and Jerry must unravel the truth behind the town's legend, or risk losing what's left of her family.