Yes they are chayav in Seudas Purim! (However, stop the limud there).
In my kitzur, there is footnote section called (Darchei HaHalacha (al pi Maran Ha Shulchan Aruch, Ben Ish Chai, and the Kaf HaChaim).
The footnote states: All the mitzvos of Purim apply to women. Megilla, Al HaNissim, Seuda, Mishloach Manos and Matanos L’Evyonim.
The lone exception is the mitzva of “l’visumei”, of which she is not obligated AND IS OSSUR FOR HER!!
(end of quote)
In other words, women are commanded to partake in the seuda, and are forbidden to drink. Additionally we see that the mitzvos of seuda and drinking are not “one in the same”.