Shopping: the issue seems to me that her parents (no younger kids at this point) have a bigger house than they can afford to easily maintain and are probably not so young either. For whatever reason they choose to continue living in this huge home but need their daugter?s help. Apparently she’s not paying for utilities, food or rent and although the house is a burden it definitely seems comfortable so she’s benefitting greatly.
The real questions are how much money are we talking about and how much is she earning? Are her parents paying for her schooling? I don’t have all information so I could be wrong but it seems to me she’s getting a great deal and some hakoras hatov is in order.