I think most people assume women are not obligated to drink ad d’lo yada on Purim. The usual explanation is that it would be a breach of tzniyus. However, R’ Ephraim Greenblatt in his Shu”T Rivevos Ephraim (I:458) suggests a chiddush: the whole point of drinking is to reach a state of bliss that can be achieved (at least while sober) only when Amalek no longer exists. It’s a taste of the Messianic era, when the mitzvah of war with Amalek will finally be won with a victory and there will be no more "arur Haman" to hate. The celebration therefore only applies to men, who have the mitzvah of fighting Amalek – for women who are exempt from going to war, there is no chiyuv.