My girlfriend has a cold and says she is in a bad mood, what should I do?

Go buy medicine! Stay with her, tell her jokes, and sing love songs to her. If she is bored at home, take her out to play. It is better not to go out because she has a cold! Going out may aggravate the condition, so you have to be considerate of her. ! =Take her out to play after she recovers. This is all I can think of, hope it helps. Use your mobile phone to call her