Answer:
a reference group.
Step-by-step explanation:
Reference group: In psychology, the term "reference group" is determined as a specific collection of individuals that a person uses as a certain standard of comparison for himself or herself irrespective of whether he or she is part of that particular group or not. Therefore, an individual tends to rely on "reference groups" to comprehend specific social norms, which results in shaping the person's behavior, values, appearance, and ideas.
In the question above, the woman's classmates could be considered as a "reference group".