Resolving your girlfriend's anger does not necessarily require sending red envelopes to solve the problem, but should be handled through communication and understanding. Here are some suggestions:

1. **Listen and understand**: You need to listen patiently to your girlfriend's dissatisfaction and reasons, do not interrupt her, and let her feel that you are listening to her seriously.

2. **Apologise and admit mistakes**: If you did something wrong, apologize sincerely. Admitting a mistake is not a sign of weakness, but a sign of maturity and responsibility.

3. **Communication and Expression**: Use words to express your apology and concern for her, tell her that you are willing to correct her mistakes, and ask her how she hopes you can improve.

4. **Problem Solving**: Discuss a solution to the problem and work together to find a solution acceptable to both parties.

5. **Give time and space**: If she needs time to calm down, give her some space. Don't get too involved, as this may aggravate the conflict.

6. **Care and consideration**: After she calms down, use actions to show your care and consideration, such as Do something for her that she enjoys or take her somewhere she likes.

7. **Avoid Repeating Mistakes**: Make sure you understand why she was angry and work hard not to make the same mistake again.

8. **Establish rules**: Discuss and establish some basic communication rules, such as not making decisions out of anger, not using hurtful words, etc.

9. **Enhance trust**: Enhance mutual trust through consistent behavior and commitment.

10. **Seek professional help**: If you often argue over the same issue, you may need to seek help from an emotional counselor or psychologist.

In short, giving out red envelopes may be just a stop-gap measure, and it cannot solve the underlying problem. The real solution lies in communication, understanding and working together.