1. Direct communication: communicate directly with your friend and her husband to express their concern and worry. Understand their ideas and plans, and whether they have taken action to solve the problem.

2. Give advice: If your friend and her husband haven't taken action, you can give them some advice, such as:

-Try to seek the help of a marriage counselor to improve their relationship.

-Encourage them to participate in some activities to improve the relationship between husband and wife, such as couples therapy and marriage education courses.

-Give them enough space and time to think and reflect calmly and avoid being too tough or accusing.

3. Give support: No matter what method you take, you need to give your friend and her husband enough support and encouragement. Help them maintain a positive attitude and confidence, and let them know that their decision is correct and that someone supports them.

4. Respect others: No matter what the final result is, we should respect their decisions and choices. Avoid interfering or criticizing their private lives, and let them decide for themselves how to deal with their marriage problems.

Most importantly, make sure that your actions don't make things worse. Before taking any action, please make sure that you have fully understood the situation and considered all possible consequences.