This is a book published BEFORE 2015, main character is a girl, side characters include her grandma (might? Be a witch?), a boy who can shape shift into a horse or dog/wolf by putting a carved bone/stone under his tongue, a queen whos murders have literally STAINED the land, wolves that talk. The grandmother makes this girl this amazing coat that she SEWED HERBS AND CHARMS INTO, LITERALLY THE COAT OF MY DREAMS, shes like “dont fucking go into the woods”, and makes sachets of charms for the granddaughter. Granddaughter OBVIOUSLY goes into the woods, gets spooked by wolves i think? Starts running, she actually like crashes into water i think? And sees the horse boy, who is in horse form im Pretty Sure. And im 99.9% sure the book changes povs from her and the horse doggo boy every few chaps. Anyways the land they’re in has special rules!! Like “if you turn your clothes inside out you are invisible”. Cover is a girl with a patchwork quilt coat on a horse.
Lost Classics of Teen Lit: Name That Book! 