A girl said she was upset, so I told her not to say anything. How can I make her happy?

If you want to make a distracted girl happy, you can tell her a joke, dress up ugly to make her happy, and take her out for a walk, such as taking her shopping, watching a funny movie, eating a delicious meal and a delicious dessert, or taking her to exercise and sing in KTV. ...

There are many ways, depending on whether you have the patience and time to play with her, vent and distract her attention. Don't ask her anything she doesn't want to say. The more you ask her, the more unhappy she may be. It is best to simply divert her attention from her troubles. You can also take this opportunity to get along with her, cultivate feelings and let her know that when she is sad, there is another one you are willing to accompany her.