Showing Broken Ones by Sophia Martin

After Louise's abusive brother-in-law puts her in the hospital, she rounds up her sister, her nephew, and two nieces to escape north. As they pass an Amber Alert on the freeway, they realize they've become fugitives. It looks like they may be able to hide out in a small mountain town, but soon, they realize the cabin they rented is not the haven they hoped for.