The article implies that she was living with her mother and stepfather at the age of 17. If not earlier for some of the time. (I can’t be bothered to read again to check). I assume living with in the context of law doesn’t have to mean 7 days a week.
A parent and child in an EOW living arrangement would surely be counted as living as a family.
Very sad story, from the foster care and not meeting stepfather until the wedding. But presumably met mother to fit bridesmaid dress etc... The stepfather abused her and the mother let her down very badly.