My girlfriend is in a bad mood. Let me not ask her why she is in a bad mood, but she sent a message saying that she was very excited.

Everyone's emotional expression is different. There may be some girls who want to talk to their boyfriends when they are unhappy, which will make them feel better, but obviously your girlfriend is not such a girl. When she is sad, she may want to calm herself down. She should be a more rational girl. When she encounters a problem, she wants to think it over first, so at this time, you should not ask her what happened again and again, because she will feel even more sad if you do so. You should stay with her, do something you can, or give her a hug, tell her when she wants to talk to you, and then hug her.