Does a lady have a Chiuv to eat on Erev Yom Kippur? The Shaagas Aryeh questions from one side it is a Mitzvas Asei Shehazman Grama and they should be Pottur. However they have a Chiuv to fast on Yom Kippur and maybe if you have to fast you also have to eat the day prior? The Shaagas Aryeh leaves it as a Tzoruch Iyun.
By Hilchos Tefilah, Tosafos are quoted in the famous controversy regarding whether women are obligated to daven. They say that the rule that women are from a time-bound, positive commandment only applies to mitzvos di'oraisa (commandments that the Torah itself directs us to do). Regarding Rabbinic Mitzvos this rule does not necessarily apply.
Hacham Yishak Yosef in Yalkut Yosef Moadim Page 74 (or Siman 604, Seif 6 in the Kisur version), says that women are obligated to eat Erev Yom Kippur, because the Pasuk brings the commandment in the form of a negative commandment, i.e. Veinitem.
I found that the Ksav Sofer says that women do have a Chiyuv to eat on Erev Yom Kippur.