What does Daisy do the night before her wedding?

Jordan tells Nick that when Daisy was eighteen and Jordan sixteen, the two had been volunteers with the Red Cross. Though all the officers at the military base had courted Daisy, she fell passionately in love with a young lieutenant named Jay Gatsby. Though she had promised to wait for Gatsby's return, she accepted Tom Buchanan's proposal of marriage while Gatsby was still away at war. The night before her wedding, Daisy suddenly realized the enormity of her mistake; she became hysterical and drank herself into a stupor.