sammyjoe:
The Gemorah says Chayiv Inish, not Eisha 😉
From here (and other places) the Pri Chadash bring a rayah that women are not chayiv in Purim, only in Megillah. The Rambam seems to agree with this (as he says Miegillah is a chyiv on everyone, but fails to say so by the other mitzvos), but the Rama argues and says all the mitzvos apply to women as well.
As such, I can’t think of a reason off the top of my head why women should be Patur from drinking (assuming like the Rema.)