Since you are good friends, you can give her some thoughtful gifts to make her feel that in addition to love, friendship can make her feel warm and thoughtful. For example, accompany her to get a new hairstyle to change her mood, which also means "start all over again".
Another example is to give her a beautiful small ornament, such as a personalized makeup mirror. Engrave encouraging words on the mirror. She will use it every day and will see your encouragement when she uses it. It is a very thoughtful and practical gift.
Of course, you can also choose a quieter coffee shop, listen to your good friend tell her story, and then tell her your suggestions, hoping that she can cheer up and get rid of it as soon as possible.
Finally, you can take your good friend out to have a good time. Your company is the best gift. Deliberately choose to go to the beach or go hiking; let her shout out her unhappiness on the top of the mountain, and cry loudly when she wants to cry, so that she can vent once, so that her mood will be much better, and she will slowly cheer up.