Madame Loisel was a popular guest at the ball. Dressed in a beautiful gown and bedecked in the borrowed necklace, she finally feels as if she's in her element; this is illustrated by her behavior.
Mme. Loisel is friendly and outgoing, and she catches the attention of everyone in the room. She dances with anyone who asks and continues partying long after the weary M. Loisel has fallen asleep with other sleepy party goers in another room.