Answer:
Indeed, if when Gloria started her job at cosmetic company she was handed a document stating her job description, but then the CEO asked her to do certain tasks not listed in her job description, Gloria could refuse to do these additional tasks. This is so because the labor contract that would have been initially signed would establish a monthly payment for a certain number of tasks, which, by adding other tasks for the same amount, would be incurring labor exploitation. Therefore, Gloria could demand a raise, a new contract or even refuse to carry out those tasks without this being grounds for termination for cause by the employer.