Final answer:
Donna fits into the Responsibility stage of Schaie's theory of cognitive development, as she is concerned with familial and career responsibilities.
Step-by-step explanation:
Based on Schaie's theory of cognitive development, Donna seems to be at the Responsibility stage. Schaie describes this stage as occurring during early and middle adulthood when individuals are focusing on protecting and nourishing their families and careers. Donna's contemplation over providing a loan to her daughter suggests that she is deeply concerned with her familial responsibilities and the well-being of her business, which aligns with the Responsability stage characteristics.