My daughter is looking for a book that she checked out of the library in the early ’90s. This was probably a middle schoolers book. Two Sisters move with their parents a long drive away from where they previously lived. The first night they have to sleep on the floor in sleeping bags. They both want the bedroom that has some sort of alcove or passageway that ( might) lead to the outside. They fight, and one sister climbs out the window (?) and falls and possibly breaks her arm (?) . The story is told from the POV of the younger sister. They possibly have moved to a small town and the house might be a Farmhouse type house or older home.