I would vote as including in Social History. Since the abuse is mentioned, then it clearly is a factor in evaluation and treatment(s).
Social is defined as: Of or relating to human society, the interaction of the individual and the group, or the welfare of human beings as members of society; Living together in communities. (Sometimes we live well within the community, sometimes not so much as in the case of domestic violence.)
Medical history from
http://www.medilexicon.com/medicaldictionary.php?t=41172
Definitions:
1. a narrative or record of past events and circumstances that are or may be relevant to a patient's current state of health. Informally, an account of past diseases, injuries, treatments, and other strictly medical facts. More formally, a comprehensive statement of facts pertaining to past and present health gathered, ideally from the patient, by directed questioning and organized under the following heads.
Chief Complaint (CC): a brief statement of the complaint or incident that prompted medical consultation.
History of Present Illness (HPI): a detailed chronologic narrative, as much as possible in the patient's own words, of the development of the current health problem from its onset to the present.
Past Medical History (PMH): prior illnesses, their treatments and sequelae.
Social History (SH): marital status, past and present occupations, travel, hobbies, stresses, diet, habits, and use of tobacco, alcohol, or drugs. (domestic abuse would clearly be a stressor)
Family History (FH); present health or cause of death of parents, brothers, sisters, with particular attention to hereditary disorders.
Review of Systems (ROS): an exhaustive survey of symptoms or diseases, organized by body system, not covered in previous parts of the history.