then add her discountI can't handle this one. She has a long history of working in a supermarket, or least in the industry. She should know the prices of basic products, or easy access to compare prices from Chrisco.
She's also in the vicinity of these stores, so the whole "I don't like to go to the shops as it's crowded" excuse doesn't work, nor does "I don't have any supermarkets within 30mins".