She follows non-human study subject
Step-by-step explanation:
This is non-human study subject as she is doing research on the food items which are more consumed by the people. In this study she don't need to collect identifiers as the source topic is the food.
She just want to collect the data of the availability of different type of junk food in the market place which are mostly consumed by the consumers. In this type of topic she don't need to collect identifiers.