When you think about food safety, the first thing you think about might be whether the food is thoroughly cooked. What can be more important is how the food is stored before and after it's cooked. If you haven't paid much attention to how your elderly family member is storing her food, it might be time to take a closer look.
Check Whether the Food Requires Refrigeration
Some foods require refrigeration, but that may not have been how your family stored them ...