What should a daughter do as a mother when she is angry with her husband?

Nothing you can do can stop it. In fact, you may not be able to help, or it's best not to intervene. What you can do is to analyze the situation with your daughter and how to deal with it best. If the daughter is wrong, we should guide her to improve in a good direction. If it is the fault of the other party, then it is recommended that the daughter and her husband communicate well, run in by themselves and set a bottom line. If it can't be solved, then consider the follow-up question, whether it is worth enduring or leaving. My daughter's life will eventually have to go by herself and choose by herself. You can help, but you can't interfere