My mother-in-law loves to complain to me too much. I'm very upset recently? Do something for me, okay?

First of all, you should thank her for trusting you. Only when she trusts you will she tell you the truth.

Never show impatience, or you will hurt her.

If you don't want to waste time listening to her nagging, don't listen passively. You can interrupt in the middle and take the initiative in the conversation. Or try to shorten the conversation time while comforting her.

You can also encourage her to participate in some activities organized by the elderly in the community. As long as she has someone else to talk to, you can rest assured.