Amilia Anne is Dead and Gone by Kat Rosenfield

Becca has always longed to break free from her small, backwater hometown. But the discovery of an unidentified dead girl on the side of a dirt road sends the town–and Becca–into a tailspin. Unable to make sense of the violence of the outside world creeping into her backyard, Becca finds herself retreating inward, paralyzed from moving forward for the first time in her life.