Final answer:
The nurse should instruct the client to increase her fluid intake to thin secretions.
Step-by-step explanation:
The nurse should instruct the client to increase her fluid intake to thin the secretions. Thick and sticky secretions can make it difficult to cough up mucus, so increasing fluid intake can help to thin the secretions and make them easier to expel. This can be done by drinking plenty of fluids such as water, herbal tea, and warm broths. It is important to stay hydrated to maintain respiratory health in cases of chronic obstructive pulmonary disease (COPD).