Harry has a twin

Harry has a twin, she's very smart, but she grew up seperate from Harry, in a not so great upbringing. She is also not biologically James' daughter. She to struggles navigating the wizarding world as not only a Muggle-raised Slytherin but also while blind. Will Hogwarts provide an escape from her horrible Muggle life or will it be even harder? and will she find family there?