Meaning: This sentence describes a girl who laughed in a happy and carefree manner because she heard something funny.
Choice of Words: The choice of words in this sentence are simple and easy to understand for an English learner. The word "girl" is used to refer to a young female person. The word "laughed" is used to describe the sound that a person makes when they find something funny. The word "joyfully" is used to describe the way in which the girl laughed. The word "at" is used to indicate the reason for the girl's laughter. The word "joke" is used to refer to something that is said or done to make people laugh.