Do you have a last name and the parish where they lived in England? If not, I think it would be impossible to trace her yourself; the details are too sketchy. If you do have those, you could contact the department of records for where she lived. If not, a genealogist could probably help you for a fee. If you know where she was killed, there could be newspaper articles available in a research library about the murder. Again, I think you have to have a little more data than you are giving here.