Answer:
Role strain.
Step-by-step explanation:
Isabella is most likely feeling role strain giving that, according to role theorists definition, role strain occurs when a person has difficulties meeting the responsibilities of a role in his life (Isabella and her dormitory responsibilities). The love Isabella has for her brother is making keeping her responsiblities at her campus difficult. Hence, she experiences role strain because she is having a hard time meeting the responsibilities of this particular role in her life.