Some kind of animal

 

Summary: Jo lives in the same Appalachian town where her mother disappeared fifteen years ago. Everyone knows what happened to Jo's mom. She was wild, and bad things happen to girls like that. Now people are starting to talk about Jo. She's barely passing her classes and falls asleep at her desk every day. She's following in her mom's footsteps. Jo does have a secret. It's not what people think, though. Not a boy or a drug habit. Jo has a twin sister. Jo's sister is not like most people. She lives in the woods--catches rabbits with her bare hands and eats them raw. Night after night, Jo slips out of her bedroom window and meets her sister in the trees. And together they run, fearlessly. The thing is, no one's ever seen Jo's sister. So when her twin attacks a boy from town, everyone assumes that it was Jo. Which means Jo has to decide--does she tell the world about her sister, or does she run?

Grandmother was a rude hag, really did have a sister. She hid in the woods her entire life, holding secrets about their mother and how got separated in first place. Jo really did anything for her sister so I don't believe she deserved everything that ended up going down. Especially how crazy her mother was, being reason got separated from sister and felt unwanted. 

Very slow burn style, will give you some through details and features to ponder over. Some parts can get little confusing but it all gets explained in the end.