Which line in this excerpt from Guy de Maupassant's The Necklace reveals situational irony?

The line in the excerpt that reveals situational irony is "She danced with passion, intoxicated by pleasure, forgetting everything in the triumph of her beauty, in the glory of her success, in a sort of cloud of happiness. ". This is ironic because Mathilde believes she is reveling in luxury and happiness, when in reality she is unknowingly setting the stage for her future hardship and suffering due to losing the necklace.